TEMPERATURE AND TIME OF DEVELOPMENT THE TWO SEXES IN DROSOPHILA
|
|
- Tamsyn Williams
- 5 years ago
- Views:
Transcription
1 TEMPERATURE AND TME OF DEVELOPMENT THE TWO SEXES N DROSOPHLA BY GERT BONNER. (From the Zootomcal nsttuton, Unversty of Stockholm.) (Receved th May.) (Wth Four Text-fgures.). NTRODUCTON. METHODS. ALL who have worked wth Drosophla know that the females are the frst to hatch n the culture-bottles. Ths fact makes t very probable that the females develop n a shorter tme than do the males. However, t s not a pror necessary that t must be so. t could also possbly depend upon a hghly selectve mortalty among the frst eggs from each female. n order to study ths queston n more detal the followng nvestgaton was undertaken. The fles used belong to the yellow stock. The sex-lnked mutant yellow has a vablty almost as great as that of the wld type fles. The cause why these latter fles were not used, was that possessed a culture of trplods carryng yellow n ther X-chromosomes, and that t was my ntenton to compare the tme of development not only of the two normal sexes but also of the ntersexes. Unfortunately, have untl now not succeeded wth the ntersexes. Before the experments were begun a rather great number of ordnary culture-bottles (about 0) were made up and fve to eght pars of fles were put n each of them. There they were left for about three days n order to make t probable that all the females had been fertlsed. Next, the same number of culture-bottles was made up, but contrary to the ordnary method, to these bottles no paper was added. The fles from the old bottles were then transferred to the new ones where they were left for two hours only. When the two hours had elapsed, the bottles were empted and left n the ncubator untl pupaton began. n bottles wthout paper pupaton takes place ether on the surface of the food or on the walls of the bottle, and snce my bottles are cylndrcal n shape and only contan 00 c.c. each, t s qute mpossble for the pupae to escape observaton. Durng the whole perod of pupaton the bottles were controlled every second hour, and the pupae, whch had pupated durng the last -hour perod were transferred to vals contanng mostened flter-paper. These vals were then labelled wth the pupaton-perod and left n the ncubator untl the begnnng of hatchng. As n the case of pupaton, the vals were controlled every second hour durng the whole tme of hatchng. By ths method t s possble to be nformed for each ndvdual female and each ndvdual male upon how many perods of hours t takes, () from^fe layng of the egg up to the moment of pupaton, and () from ths moment upto the moment of hatchng. There s one possble source of error due to the fact that
2 Temperature and Tme of Development of the Sexes n Drosophla sometmes develop to some extent before layng. thnk, however, that ^P does not nfluence the averages very much, and snce the am of ths nvestgaton s to compare the tme of development of dfferent groups of anmals, the error may be left out of consderaton by ths comparson. As stated above, the eggs for whch the tme of development have been calculated, have all been lad wthn a perod of only hours. Ths means that t s very much a matter of chance f we get many or few ndvduals upon whch to control the tme. The experments, whch have been carred out n an ncubator, have been made at two dfferent temperatures, vz. C. and 0 0 C. n the frst case got a qute suffcent number of ndvduals, vz. 0. n the second, however, got only ndvduals. Ths low fgure s almost certanly due to the heavy mortalty at the hgh temperature of 0 C. Snce ths last experment nevertheless gave some decsve results and snce the experments are rather laborous (t s necessary to control the cultures for hours or more) they were not repeated.. THE EXPERMENTS. n the calculaton of the tme of development up to the moment of pupaton, we may magne that all the eggs have been lad just at the mddle of the -hour perod. And lkewse, n the calculaton of the pupal tme t s magned that all the pupae have pupated just at the mddle of the dfferent -hour perods. Ths approxmaton s necessary for the statstcal treatment of the problem and does not nvolve any error snce, on an average, the same number of eggs have been lad before as after the md-pont of the perod and the same number of pupae have pupated before as after the md-pont. Experment at 0 C. (a) Tme from egg-layng up to pupaton. The dstrbuton of ths tme for the dfferent ndvduals s shown n Tables and and n Fg.. From the tables we fnd the mean and ts mean error to be For the females - ± 0- hours, For the males ± 0-0 hours. The dfference between these two tmes s 0- hours and ts mean error s 0- hours. And as 0- : 0- = 0- t s obvous that the dfference between the tme of development of the females and of the males s wthout any statstcal sgnfcance. (b) Tme durng the pupal stage. Ths tme s to be found n Tables and and n Fg.. Here we have the mean and ts mean error: For the females - ± 0- hours, For the males - ± 0- hours. 'The dfference of these tmes and ts mean error are respectvely -0 hours ^B hours; and as *0 : 0-0 = 0- t s correct to conclude that the males are sgnfcantly slower n ther development durng the pupal stage than are the females. -
3 GERT BONNER Table. Showng the number of Females dstrbuted accordng to ther tme of development at 0 C.; () up to the moment of pupaton, and () durng the pupal stage. Tme n hours up to the moment of pupaton Hours " - " Tme n hours durng the pupal stage n ? 0 H 0 0 n Table. Shovnng the number of Males dstrbuted accordng to ther tme of development at 0 C.; () up to the moment of pupaton, and () durng the pupal stage. Tme n hours up to the moment of pupaton Hours 0- O "- " S c > G w OD. g * s A ' O 0 0 Table. Showng the number of Females dstrbuted accordng to ther tme of development at 0 0 C.; () up to the moment of pupaton, and () durng the pupal stage. Tme n hours up to the moment of pupaton Tme n hours durng the pupal stage Hours ^
4
5 0 GERT BONNER Experment at 0 0 C. (a) Tme from egg-layng up to pupaton. The means are (Tables and Fg. ): For the females... - ± 0* hours, For the males ± 0- hours. The mean error of the dfference s 0- hours, and snce(o- -) :o- = - t s very probable that the dfference between the tme of development of the two sexes s of a real sgnfcance. Table V. Showng the number of Males dstrbuted accordng to ther tme of development at 0 0 C.; () up to the moment of pupaton, and () durng the pupal stage. m c ft E- Hours Number Tme n hours up to the moment of pupaton -0 / N 0-0 va ' ; O-O 0 V > Hours U) 0 0 Fg.. Tme of development up to the moment of pupaton at 0 0 C. of females and males. 0 0
6 Temperature and Tme of Development of the Sexes n Drosophla Tme durng the pupal stage. The means for ths perod are (Tables and Fg. ): For the females - ± 0-0 hours, For the males - ± 0- hours. The dfference and ts mean error beng respectvely -n and o-o, we have - : o-o = 0-, and the dfference must thus be of a real sgnfcance. Number 0 0 / * A -' / V / s f Hours Fg.. Tme of development durng the pupal stage at 0 0 C. of f femalesl d and males l. J
7 GERT BONNER. DSCUSSON. As may be seen from the above statements, there s at 0 as well as at 0 0 a markedly longer tme of development for the males than for the females. At 0 C, however, ths lengthenng s confned to the pupal stage, the tme up to pupaton beng the same for the two sexes. t seems not unlkely that ths may be correlated wth the fact that the essental parts of the secondary sexual characters are developed durng the pupal stage. But f ths correlaton s a true one, then probably we also may suppose that at 0 0 C. these characters develop earler, not only n an absolute sense, but also n a relatve one, snce namely the fgures show that here the tme up to pupaton as well as that durng the pupal stage s longer for the males than for the females. Ths supposton must, however, be confrmed by an embryologc nvestgaton. f we look at the tables, especally Tables and V, t s seen that the fgures to a great extent are dstrbuted along the dagonal endng n the upper rght corner. Ths fact ndcates that there s some knd of correlaton between the tme up to pupaton and the tme durng the pupal stage. From Tables and ( C.) we also fnd the coeffcent of correlaton, r, to be (accordng to Bravas' formula): For the females r = 0- ± 0-00, For the males r = 0-0 ± 0-0. t s therefore probably correct to suppose that at least for the males for those ndvduals whch have had a consderably long tme of development up to the moment of pupaton, ths long tme as a rule s compensated by a shorter tme durng the pupal stage and vce versa. That the tme of development s shorter at the hgher than at the lower temperature s qute conformng wth what we know about the nfluence of temperature on development. But there s a very nterestng fact to note, namely, that the shortenng of the tme at 0 0 C. as compared wth that at 0 C. s much more pronounced for the tme durng the pupal stage than durng the tme up to pupaton. As a coeffcent of the shortenng we may ntroduce the quotent between the tme at 0 C. and that at 0 C. t s obvous, then, that the smaller ths coeffcent s, the greater s the shortenng. n order to make the comparsons more clear, let us ntroduce a notaton. Let the means of the tmes up to pupaton be M^ and M 0 and ther mean errors m^ and nu^. Let, lkewse, the means of the tmes durng the pupal stage be P^ and P 0 and ther mean errorsp^ and p 0. Let, fnally, and /? =?. * We have then to compare a and /? and to make ths comparson for the two sexes separately. From the fgures of the dfferent tables we fnd that for the females a = 0- and ) = 0-0, for the males a = 0- and js = 0-.
8 Temperature and Tme of Development of the Sexes n Drosophla ^Let now the mean error of a be /x and the mean error of j be v. Snce M 0 ^Bdependent of M& and P 0 s ndependent of P^, /n and v must satsfy to the close-approxmaton formula: and thus and v = lef * - p a Wth the ad of the foregong fgures we therefore fnd that for the females /x = 0-00 an<^ v = ' O, for the males /x = 0-00 anc * v = The mean error of the dfference between a and j s, as usual, p = V^ + v*. Hence r ths dfference and ts mean error have the values: For the females O- ± 0-00, For the males 0- ± And, fnally, we fnd the values of the quotent - - to be For the females -, For the males -0. We may therefore wthout hestaton conclude that the more pronounced nfluence of the rasng of the temperature upon the pupal stage as compared wth the nfluence upon the pre-pupal stages s of a real and absolute sgnfcance. The method commonly used when studyng the nfluence of temperature on development s to observe the tme from the begnnng of the development up to a certan stage and to compare for a number of dfferent temperatures. The results are often plotted on a scale and t s usually tred to fnd a mathematcal expresson whch fts the curve thus obtaned. But t may tve asked f these studes are of more than of a purely descrptve value, or f they really nform us on the processes of development. As we have seen, an ncrease n the temperature has a dfferent nfluence on dfferent stages of the development. n fact, t shortens n Drosophla the tme durng the pupal stage relatvely more than t shortens the tme up to pupaton. But f we not only consder Drosophla but the organsms n general, there may exst some maxmum temperature above whch the development s not accelerated but retarded. Snce, however, dfferent stages are dfferently susceptble to the nfluence of temperature, ths maxmum temperature may very well be a dfferent Afor dfferent stages. magne, then, that a rasng of the temperature accelerates one part of the development and retards one other part, but n such a way that the total tme of development s unaltered. From a graphcal or mathematcal treatment
9 GERT BONNER we would then have concluded that temperature s wthout nfluence on the tme of development but n realty t had been an obscured but nevertheless real nflu^k of temperature. As the above data show, the tme up to pupaton n Drosoptma s the same for the two sexes at 0 C. but probably not the same at 0 0 C. As, however, the tme up to pupaton nvolves such dfferent phases of the development as the embryonc phases phases of dfferentaton and the larval stages phases of growth t may possbly only be the total tme up to pupaton n 0 C. whch concde for the two sexes, whereas for nstance one part may be slower for the males and one other part slower for the females. t seems, therefore, to me that when studyng temperature-coeffcents and other fgures of that knd, the methods ofted used are too rough to be of a greater value. f we wsh to be able to conclude anythng about the physcal and physcochemcal nature of the processes of development from the varaton of the tme of ths development n dfferent temperatures, t s necessary to study short ntervals of the development separately, and to choose the ntervals n such a way that we may nfer that there s about the same knd of processes gong on durng the whole of each separate nterval. The dffcultes here are, however, of a practcal knd: t s not easy to fnd sutable objects for such a study. The best objects are probably those wth transparent eggs where t s possble to follow each morphologcal stage. The methods then to be followed are the ordnary ones: for each separate nterval the tme of development s noted for a number of dfferent temperatures and the correspondng curve s traced. Conformng then wth the facts, shown above, to hold good n Drosophla, t s probable that the rule should be that curves, correspondng to dfferent ntervals, would be of a qute dfferent knd, ndcatng dfferent natures of the processes durng the varous ntervals.. SUMMARY.. The tme of development at 0 C. up to the moment of pupaton s found to be for females and males respectvely - ± 0- and - ± 0-0 hours. Durng the pupal stage the two tmes are - ± 0- and - ± 0- hours.. At 0 0 C. the correspondng fgures are (n the same order): - ± 0-, 0- ± 0-, - ± 0-0 and - ± 0- hours.. These fgures show that there s a statstcal sgnfcance n the dfferences of the tmes of development of the two sexes for both the perods at 0 C. but only for the pupal stage at 0 C. t s ponted out that the fact that the longer tme of male development as compared wth female development at C. s confned to the pupal stage, may be correlated wth the other fact that the essental parts of the secondary sexual characters are developed durng ths stage.. t s shown that there s a negatve correlaton between the pre-pupau pupal tmes of development, ndcatng that the longer the frst tme s, the shojtev s, as a rule, the other tme and vce versa.
10 Temperature and Tme of Development of the Sexes n Drosophla Wth the ad of statstcal methods t s shown that the shortenng of the ^of development at 0 0 C. as compared wth the tme at C. s much more pronounced for the pupal than for the pre-pupal stage.. Ths last fact s dscussed and t s emphassed that the ordnary methods of studyng the nfluence of temperature on development are too rough to be of more than of a descrptve value, the only way of gettng a deeper nsght nto the processes of development by temperature studes beng the separate studes of a number of short ntervals.
42 Lyon. 4 COWBIRD PARASITISM OF THE NORTHERN YELLOW-THROAT. s¾ r. s. nofst, UND
[ Auk 42 Lyon. 4 COWBIRD PARASITISM OF THE NORTHERN YELLOW-THROAT s¾ r. s. nofst, UND DURXNG the summers of 948 through 95 I made an ntensve study of the lfe hstory of the Yellow-throat (Geothlyps trchas).
More informationCAS LX 522 Syntax I. It is likely. Reluctance to leave. Reluctance to leave. Reluctance to leave. Reluctance. Week 14b.
CAS LX 522 Syntax Week 14b. PRO and control t lkely Th satfes the EPP n both clauses. The man clause has n Spec. The embedded clause has the trace n Spec. Th specfc nstance of A- movement, where we move
More informationThis paper not to be cited without prior reference to the authors
Ths paper not to be cted wthout pror reference to the authors ' nternatonal Councl for the Exploraton of the Sea C.~11974/F:45 Demersal Fsh (N) Commttee OBSERVATON~ FROM THE BARENTS SEA N SPRNG 1973 a~
More information19U. aubaittod la partial fulfiliawst of the OF SCIE5CB. Department of Poultry Husbandry OF ACGRICULTUBE AMD APPLIED 8CIEHC1
EFFECT Of VAKTHG LBFBLB OF CALCUM Of THE CALCUM BALANCE, SHELL TEJUBS, AMD BLOOD CALCUM LEVEL OF W8XTB U8B0K FULLETS B. «., Stat* Collec* of WuhlAgfeoa* 1959 aubattod la partal fulflawst of the requr*a«tb
More information(Received 17 September 2004; accepted 1 July 2005) dairy cow / mastitis / risk / dry-cow treatment / meta-analysis
Vet. Res. 37 (2006) 25 48 INRA, EDP Scences, 2005 DOI: 10.1051/vetres:2005047 25 Orgnal artcle Incdence of ntramammary nfectons durng the dry perod wthout or wth antbotc treatment n dary cows a quanttatve
More informationPitfalls in Modeling Loss Given Default of Bank Loans
Ptfalls n Modelng Loss Gven Default of Bank Loans by Marc Gürtler * and Martn Hbbeln ** * Professor Dr. Marc Gürtler Braunschweg Insttute of Technology Department of Fnance Abt-Jerusalem-Str. 7 3806 Braunschweg
More informationTHE SEX-RATIO AND THE PRODUCTION OF THE MALLARD, ANAS PLATYRHYNCHOS L.
THE SEX-RATIO AND THE PRODUCTION OF THE MALLARD, ANAS PLATYRHYNCHOS L. by J. A. EYGENRAAM INSTITUUT VOOR TOEGEPAST BIOLOGISCH ONDERZOEK IN DE NATUUR (ITBON) ARNHEM, KEMPERBERGERWEG 11 MEDEDELING NR. 34/1957
More informationEstimating nest abundance while accounting for time-to-event processes and imperfect detection
Ecology, 95(9), 2014, pp. 2548 2557 Ó 2014 by the Ecologcal Socety of Amerca Estmatng nest abundance whle accountng for tme-to-event processes and mperfect detecton GUILLAUME PE RON, 1,4,5 JOHANN WALKER,
More informationSpecific effects of feeding different amounts of potassium iodide and salt on the character of the wool production of breeding ewes and their lambs
Retrospectve Theses and Dssertatons 1928 Specfc effects of feedng dfferent amounts of potassum odde and salt on the character of the wool producton of breedng ewes and ther lambs Maynard Goldman Snell
More informationMobility Analysis of the Population of Rabat-Salé-Zemmour-Zaer
World Acadey of Scence, Engneerng and Technology 9 2007 Moblty Analyss of the Populaton of Rabat-Salé-Zeour-Zaer F. Ghat Abstract In ths paper, we present the 2006 survey study orgn destnaton and prce
More informationStrasbourg, 20 May 1981 DECS/Doc (81) 9 Or. Engl. COUNCIL FOR CULTURAL CO-OPERATION. EUDISED multilingual thesaurus
COE147665 Strasbourg, 20 May 1981 DECS/Doc (81) 9 Or. Engl. COUNCIL FOR CULTURAL CO-OPERATION EUDISED multlngual thesaurus EUDlSED multlngual thesaurus management group Restrcted meetng Brussels, 12 May
More informationNO CEG-KO-03 APPROVALS DEV. PROCUREMENT. K. Endo M. Sampson D. Newcomb G. Perezchica I. Estorga K. Takigawa
K. Endo M. Sampson D. Newcomb G. Perezchca I. Estorga K. Takgawa 1.0 SCOPE Ths document specfes the general requrements for mass producton supplers and/or tool bulders that work drectly wth Sumtomo Electrc
More informationLOW POWER PARALLEL PREFIX ADDER
Appled Mechancs and Materals Onlne: 2014-06-18 ISSN: 1662-7482, Vol. 573, pp 194-200 do:10.4028/www.scentfc.net/amm.573.194 2014 Trans Tech Publcatons, Swtzerland LOW POWER PARALLEL PREFIX ADDER P.Kowsalya
More informationParental behaviour of a precocial species: implications for juvenile survival
Journal of Appled Ecology 29, 46, 87 878 Parental behavour of a precocal speces: mplcatons for juvenle survval Vctora J Dretz* Colorado Dvson of Wldlfe, 317 West Prospect Road, Fort Collns, CO 8526, USA
More informationCOST STUJY EGG. Jnl. 1- i)y I 9 5Li- CCU n TY )LI \ I I I. l~eport. i Agricultural Extension Service I I. i '
~, ----- - ------------ Jnl. - )y tj ' )L \ EGG! COST STUJY -! S Fl 9 5L- D E G fj l~eport CCU n TY! Agrcultural Extenson Servce j Unversty of Calforna l [ ; Prepared n Cooperaton wth the San Dego County
More informationPattern and Motion Vision in Cats with Selective Loss of Cortical Directional Selectivity
The Journal of Neuroscence Aprl 1986, 6(4): 938-945 Pattern and Moton Vson n Cats wth Selectve Loss of Cortcal Drectonal Selectvty Tatana Pasternak and Laura J. Lenen Center for Vsual Scence and Center
More informationOREGON STATE GAME COMMISSION UILETIN SEPTEMBER-OCTOBER, 1965
OREGON STATE GAME COMMSSON ULETN SEPTEMBER-OCTOBER, 1965 OREGON STATE GAME COMMSSON ULETN September-October, 1965 Number 5, Volume 20 Publshed Bmonthly by the OREGON STATE GAME COMMSSON 1634 S.W. Alder
More informationAN EFFECT OF X RAYS ON THE LINKAGE OF MENDELIAN CHARACTERS IN THE FIRST CHROMOSOME OF DROSOPHILA
AN EFFECT OF X RAYS ON THE LNKAGE OF MENDELAN CHARACTERS N THE FRST CHROMOSOME OF DROSOPHLA JAMES W. MAVOR Union College, Schenectady, New York Received March 18, 1923 TABLE OF CONTENTS PAGE NTRODUCTON...
More informationControlling tick borne diseases through domestic animal management: a theoretical approach. Ros Johnson
Controllng tck borne deae through dometc anmal management: a theoretcal approach Ro Johnon Dr Rachel Norman Dr Lucy Glbert Talk Outlne Background of tck bology Management trategy Model Reult Future plan
More informationLoss given default modeling: a comparative analysis
Journal of Rsk Model Valdaton Volume 7/Number 1, Sprng 213 (25 59) Loss gven default modelng: a comparatve analyss Olga Yashkr Yashkr Consultng, 197 25 Wood Street, Toronto, M4Y 2P9, Canada; emal: olga.yashkr@gmal.com
More informationTHE ÜNr/ERSITY OF OKLAHCMA GRADUATE COLLEGE (VIREO ATRIGAPILLUS) SUBMITTED TO THE GRADUATE FACULTY. in partial fulfillment of the requirements for the
THE ÜNr/ERSTY OF OKLAHCMA GRADUATE COLLEGE A BOEGOLOGGAL STUDY OF THE BLACK-GAPPED VREO (VREO ATRGAPLLUS) A DSSERTATON SUBMTTED TO THE GRADUATE FACULTY n partal fulfllment of the requrements for the degree
More informationCanada. du Canada. Bibliothèque nationale. National Library. Acquisitions et. Bibliographie Services. Acquisitions and. ûttawaûn KtAON4 Canada
Natonal Lbrary Acqustons and Bblographe Servces Bblothèque natonale du Canada Acqustons et servces bblographques 395 Wellngton Street Ottawa ON KI A ON4 395, rue Wdlngtm ûttawaûn KtAON4 Canada Canada The
More informationT not always autonomous (STURTEVANT 1932). By transplantation experiments
DEVELOPMENT OF EYE COLORS N DROSOPHLA: TME OF ACTON OF BODY FLUD ON CNNABAR' MORRS HENRY HARNLY AND BORS EPHRUSS Washington Square College, New York University, New York and nstitut de Biologie Physico-Chimique,
More informationW6R THESIS MAT THE TREATMENT OF ANIMALS WITH ACUPUNCTURE THESIS. VeroniooMathies. Victorian University of Technology
H M OF ML WH UPUU H by VeronooMathes Vctoran Unversty of echnology rtrfent of Health cences n cupuncture July 992 W6 H 636.89 5892 M H M OF ML WH UPUU H by VeroncoMathes Vctoran Unversty of echnology epartment
More informationFollow this and additional works at:
The Humane Socety nsttute for Scence and Polcy Anmal Studes Repostory Summer 1981 HEH Summer 1981 Follow ths and addtonal works at: http://anmalstudesrepostory.org/humehap Recommended Ctaton "HEH Summer
More informationDeterminants of Poultry Farmers Participation in Livestock Insurance in Southwest Nigeria
Asan Journal of Poultry Scence, 2015 ISSN 1819-3609 / DOI: 10.3923/ajpsaj.2015. 2015 Academc Journals Inc. Determnants of Poultry Farmers Partcpaton n Lvestock Insurance n Southwest Ngera O.K. Akntunde
More informationPosthatch Changes in Morphology and Function of the Small Intestines in Heavy- and Light-Strain Chicks
Posthatch Changes n Morphology and Functon of the Small Intestnes n Heavy- and Lght-Stran Chcks ZEHAVA UNI, YAEL NOY, and DAVID SKLAN Faculty of Agrculture, Hebrew Unversty, P.O. Box 2, Rehovot, Israel,
More information(Communicated at the meeting of December 17, 1927).
PalaeoZoology. On the Oldest Domestc Anmal and ts sgn{cance {or Palethnology. By A. E. VAN GFFEN. (Communcated by Prof. J. F. VAN BENMELEN. ) (Communcated at the meetng of December 17, 1927). Ths paper
More informationPharmacokinetics of amoxicillin clavulanic acid combination after intravenous and intramuscular administration to turkeys and chickens
Avan Pathology ISSN: 0307-9457 (Prnt) 1465-3338 (Onlne) Journal homepage: http://www.tandfonlne.com/lo/cavp20 Pharmacoknetcs of amoxclln clavulanc acd combnaton after ntravenous and ntramuscular admnstraton
More informationTHE EFFECTS OF THE ENVIRONMENTAL CONDITIONS ON CURLY EXPRESSIVITY IN DROSOPHILA MELANOGAST ER. Ken NOZAWA
THE EFFECTS OF THE ENVIRONMENTAL CONDITIONS ON CURLY EXPRESSIVITY IN DROSOPHILA MELANOGAST ER Ken NOZAWA Department of Animal Breeding, Faculty of Agriculture, Nagoya University, Anjo, Japan Received August
More informationPath Analysis of the Relationships Between Various Body Measures and Live Weight of American Bronze Turkeys Under Three Different Lighting Programs
TARIM BİLİMLERİ DERGİİ 005, 11 () 184-188 ath Analyss of the Relatonshps Between Varous Body Measures and Lve Weght of Amercan Bronze Turkeys Under Three Dfferent Lghtng rograms Mehmet MENDEŞ 1 Al KARABAYIR
More informationHospital for Small Animals IGEST
Hosptal for Small Anmals IGEST IGEST Dplomate-led Integrated Gastroenterology Ednburgh Specalst Treatment The DIGEST Clnc conssts of a team of specalsts who have an expertse n the evaluaton of gastrontestnal
More informationNESTING SUCCESS OF GREY PARTRIDGES (PERDIX PERDIX) ON AGRICULTURAL LAND IN il NORTH-GENTRAL FRANCE: RELATION To Nssnne 'f'
' Socal behavour of hazel grouse n Chna 7 Game ano vvuume o~..e..ce, -..... `..,,..,-. Q.V ISSN 1622-7662 l 1 I l manfesté un comportement terrtoral. Leurs domanes vtaux se chevauchaent à 82 % et ls étaent
More informationON COMMERCIAL poultry farms during
Effect of Date of Hatch on Weight F. P. JEFFREY Department of Poultry Husbandry, Rutgers University, New Brunswick, New Jersey (Presented at annual meeting June, 1940; received for publication May 23,
More informationZoologicheskii Zhurnal (Zoological Journal)
/9 CRANIAL KINESIS IN LIZARDS; CONTRIBUTION TO THE PROBLEM OF THE ADAPTIVE SIGNIFICANCE OF SKULL KINESIS by N. N. Iordansky Zoologchesk Zhurnal (Zoologcal Journal) volume 45, number 9 pp. 1398-1410 1966
More informationMeeting Date: June 5, 2012 [ ] Consent [ X] Regular [ ] Ordinance [ ] Public Hearing
PALM BEACH COUNTY BOARD OF COUNTY COMMSSONERS AGENDA TEM SUMMARY Agenda tem #:St-/ ----------------------------------------------------------------- Meetng Date: June 5, 2012 [ ] Consent [ X] Regular [
More informationNew Mayflies from the Upper Mesozoic Transbaikalian Locality Chernovskie Kopi (lnsecta: Ephemerida = Ephemeroptera)
Paleontologcal Journal, Vol. 34, No. J, 2000, pp. 68-74. Tronslaledfrom Paleontologcheskl Zlum1al, No. 1, 2000, pp. 63-69. Orgnal ftussan Text Copyrght e 2000 by Sntshenkova. Englsh Translaton Copyrght
More information'". ene~getics of. greater,scaup (Aythya mari1s), and /'. lesser scaup (A. affinis) during, migration. Department of Renewah1e Resources, '
------- ------._._------------------------------------------------------_.-'._.----------- { '- Aspects of the '. enegetcs of greater scaup (Aythya mars) and /'. lesser scaup (A. affns) durng mgraton f
More informationJas per Fforde. Houghton Mifflin Harcourt Boston New York
Jas per Fforde The Chroncles of Kazam Book THREE C Houghton Mffln Harcourt Boston New York Copyrght 2014 by Jasper Fforde Orgnally publshed by Hodder & Stoughton All rghts reserved. For nformaton about
More informationCommissioner Walker asked Marci Hadley, Animal Control Officer, to explain the events that led to the hearing.
APPROVED ON DECEMBER 23, 20 BY THE BOARD OF COUNTY COMMSSONERS AT THE WEEKLY BUSNESS SESSON PUBLC HEARNG N THE MATTER OF A REQUEST BY OWNER OF A DOG OR DOGS MPOUNDED UNDER THE AUTHORTY OF ORS 609. 55,
More informationHOSPITAL, CHARITY REPORT ASSEMBLY GENERAL STATE OF LOUISIANA. -ý. Ci ORS OF AI)NIINISTRA"I. 13OARll. OF Tti r: OF '1'H1: OFT THE
REPORT OF ''H: 3OARll OF A)NNSTRA" ORS OFT THE CHARTY HOSPTAL, ''U ''S b] GENERAL ASSEMBLY OF Tt r: STATE OF LOUSANA. -. C 883. -- A. W. HYATT, STATVNER NEW ORLEAN: AND PRNTER, 7: 3 CA\' BTRF: ßP. -2486.
More information26. The Relationships between Oxygen Consumption and Duration o f Pupal-Adult Development in the Silkworm Bombyx mandarina
134 Proc. Japan Acad., 69, Ser. B (1993) [Vol. 69(B), 26. The Relationships between Oxygen Consumption and Duration o f Pupal-Adult Development in the Silkworm Bombyx mandarina By Weide SHEN and Kunikatsu
More informationTHE MASKING OF SEPIA BY WHITE, TWO RECESSIVE
Eye-Colors in Drosophila 261 THE MASKING OF SEPIA BY WHITE, TWO RECESSIVE EYE-COLORS IN DROSOPHILA Floyd T. Romberger, Jr., Purdue University During* the course of a discussion on the dilution effects
More informationINHERITANCE OF BODY WEIGHT IN DOMESTIC FOWL. Single Comb White Leghorn breeds of fowl and in their hybrids.
440 GENETICS: N. F. WATERS PROC. N. A. S. and genetical behavior of this form is not incompatible with the segmental interchange theory of circle formation in Oenothera. Summary.-It is impossible for the
More informationUNIVERSITY OF AMSTERDAM. The Netherlands. Abstract. to the Cervoidea Simpson, singly. as distinctive of a Cervine from a Bovine. animal".
Beauforta STTUTE OF TAXOOMC ZOOLOGY (ZOOLOGCAL MUSEUM) UVERSTY OF AMSTERDAM Vol. 0 no. 7 December 4, 980 The confguraton of the lacrmal orfces n Pecorans and Tragulds (Artodactyla, Mammala) and ts sgnfcance
More informationMeasuring Varroa Sensitive Hygiene
Measuring Varroa Sensitive Hygiene John R. Harbo Varroa sensitive hygiene (VSH) is a heritable trait of the honey bee that controls varroa. This trait can be added to any population of bees and may already
More informationProtein Content of Concentrates for Turkeys
JULY, 1943 BULLETN 471 UNVERSTY OF MSSOUR COLLEGE OF AGRCULTURE AGRCULTURAL EXPERMENT STATON M. F. MLLER, Director Protein Content of Concentrates for Turkeys E. M. FuNK COLUMBA, MSSOUR Protein Content
More informationPseudopus apodus (PALLAS, 1775) from Jordan, with notes on its ecology (Sqamata: Sauria: Anguidae)
HERPETOZOA 18 (3/4): 133-140 133 Wen, 30. Dezember 2005 Pseudopus apodus (PALLAS, 1775) from Jordan, wth notes on ts ecology (Sqamata: Saura: Angudae) Pseudopus apodus (PALLAS, 1775) von Jordanen, mt Bemerkungen
More informationA C E. Applications. Applications Connections Extensions
A C E Applications Connections Extensions Applications 1. In a recent year, Team 1 made 191 out of 28 free-throw attempts and Team 2 made 106 out of 160 free-throw attempts. Copy and use the percent bars
More informationStudying Mechanisms of Inheritance using Drosophila melanogaster
Revised Fall 2018 Studying Mechanisms of Inheritance using Drosophila melanogaster Learning Objectives: 1. Describe the life cycle of Drospohilia. 2. Explain why the fruit fly is an ideal model organism
More informationTemperature Gradient in the Egg-Laying Activities of the Queen Bee
The Ohio State University Knowledge Bank kb.osu.edu Ohio Journal of Science (Ohio Academy of Science) Ohio Journal of Science: Volume 30, Issue 6 (November, 1930) 1930-11 Temperature Gradient in the Egg-Laying
More informationC. W. Knox Iowa State College
Volume 12 Number 152 Factors influencing egg production Ill. The association of the date of hatch with date of first egg, sexual maturity and egg production in S. C. White Leghorns Article 1 October 1932
More informationPSEUDOSCORPIONS FROM THE KRAKATAU ISLANDS AND ADJACENT REGIONS, INDONESIA (CHELICERATA: PSEUDOSCORPIONIDA)
Memors o( the Museum of Vctora 49(2): 309-353 (1988) SSN 0814-1827 https://do.org/10.24199/j.mmv.1988.49.13 30 November 1988 PSEUDOSCORPONS FROM THE KRAKATAU SLANDS AND ADJACENT REGONS, NDONESA (CHELCERATA:
More informationLaboratory 7 The Effect of Juvenile Hormone on Metamorphosis of the Fruit Fly (Drosophila melanogaster)
Laboratory 7 The Effect of Juvenile Hormone on Metamorphosis of the Fruit Fly (Drosophila melanogaster) (portions of this manual were borrowed from Prof. Douglas Facey, Department of Biology, Saint Michael's
More informationABSTRACT GLOSSARY OF TERMS. Layman Description
VAROA MITE REPRODUCTIONS GUIDELINE Courtesy of Jeff Harris & Robert Danka USDA Honey Bee Breeding, Genetics and Physiology Lab 1157 Ben Hur Road, Baton Rouge, LA 70820 ABSTRACT The foundress mite is reproductive
More informationComparing Life Cycles
Image from Wikimedia Commons Pre-Visit Activity Grade Two Comparing Life Cycles Specific Learning Outcomes 2-1-01: Use appropriate vocabulary related to the investigations of growth and changes in animals.
More informationRoyal College of Physicians, Edinburgh.)
ON THE RELATIONSHIP OF THE THYMUS TO THE SEXUAL ORGANS'. 1. The Influence of Castration on the Thymus. By JAMES HENDERSON, M.R.C.V.S. (Three Figures in Text.) (From the Laboratory of the Royal College
More informationThe Origin of Species: Lizards in an Evolutionary Tree
The Origin of Species: Lizards in an Evolutionary Tree Cara Larracas, Stacy Lopez, Takara Yaegashi Period 4 Background Information Throughout the Caribbean Islands there is a species of anole lizards that
More informationll Gj. STUNNING OF CATTLE WITH PENETRATING CAPTIVE BOLT STUNNERS No. C/86 P.M. HUSBAND & F.D. SHAW -.J' ~,!!' 'U' Clfulo <ffiju.
No. C/86 j1 ~,!!' J. -!!' 1- CRCULATON LST DATE OFFCER NTALS RECEVED STUNNNG OF CATTLE WTH PENETRATNG CAPTVE BOLT STUNNERS BY P.M. HUSBAND & F.D. SHAW RETURN TO OFFCE WHEN CRCULATON COMPLETE ll Gj.. GfudJ~~
More informationDIPPING AND. TICK-DESTROYING AGENrl~S PART II LT.-COL. H.WATKINS-PITCHFORD, F.R.C.V.S., F.R.S.E. NATAL. Government Bacteriologist PRETORIA
DPPNG AND TCK-DESTROYNG AGENrl~S PART BY LT.-COL. H.WATKNS-PTCHFORD, F.R.C.V.S., F.R.S.E. Government Bacteriologist NATAL PRETORA THE GOVERNMENT PRNTNG AND STATONERY DFFOE j}10 5083-9.8.10-3000. Dipping
More informationEGG production of turkeys is not important
A Study of Egg Production in Bronze Turkeys S. J. MAESDEN National Agricultural Research Center, Beltsville, Maryland EGG production of turkeys is not important commercially but good egg production during
More informationTHE ABSORPTION OF WATER BY THE EGGS OF CORIXA PUNCTATA ILLIG. (HEMIPTERA-CORIXIDAE) UNDER EXPERIMENTAL CONDITIONS
THE ABSORPTION OF WATER BY THE EGGS OF CORIXA PUNCTATA ILLIG. (HEMIPTERA-CORIXIDAE) UNDER EXPERIMENTAL CONDITIONS BY C. J. BANKS (Received 12 November 194) (With Two Text-figures) Poisson (1924) states
More informationACTIVITY 1 What happened to the holly leaf-miner?
ACTIVITY 1 Introduction Holly trees (Ilex aquifolium) are common in city squares and urban parks, and several are found in Gordon Square. In this investigation, pupils collect evidence of the food chain
More informationCopyright 2014 Edmentum - All rights reserved.
Study Island Copyright 2014 Edmentum - All rights reserved. Generation Date: 04/01/2014 Generated By: Cheryl Shelton Title: Grade 3 Life Science 1. The picture above shows the life cycle of a plant. Which
More information) the monarch butterfly Reading Behavior Recording Mark Score Accurate Reading Correct / no error Substitution Omission of word Insertion of word Rereads a word, sentence or phrase Child says
More informationQuestion 3 (30 points)
Question 3 (30 points) You hope to use your hard-won 7.014 knowledge to make some extra cash over the summer, so you adopt two Chinchillas to start a Chinchilla breeding business. Your Chinchillas are
More informationselection in the opposite direction gave relatively longer tails. However, 417
GENOTYPE AND ENVRONMENT N TAL LENGTH N MCE. By S. A. BARNETT. From the Department of Zoology, Glasgow University. (Received for publication 24th February 1965) Mice (Mus musculu8 L.) of (i) inbred strains
More informationDarwin and the Family Tree of Animals
Darwin and the Family Tree of Animals Note: These links do not work. Use the links within the outline to access the images in the popup windows. This text is the same as the scrolling text in the popup
More informationDry season survival of Aedes aegypti eggs in various breeding sites
SURVIVAL OF A. AEGYPTI EGGS 433 Dry season survival of Aedes aegypti eggs in various breeding sites in the Dar es Salaam area, Tanzania * M. TRPI 1 Abstract In field experiments in different breeding sites
More informationTHE INDIVIDUALITY OF SOWS IN REGARD TO SIZE OF LITTERS
THE INDIVIDUALITY OF SOWS IN REGARD TO SIZE OF LITTERS BY CARL HALLQVZST ANIMAL BREEDIXG INSTITUTE, WIAD, ELDTOMTA, SWEDEN I N order to judge the selectional value of such characters as litter size and
More informationPopulation Dynamics at Rhyd y creuau
Population Dynamics of the Holly Leaf Miner (Phytomyza ilicis) Aims Objectives: To describe the mortality within a generation of the holly leaf miner insect To determine factors that could regulate, or
More informationthe NARCISSUS BULB FLY
, the NARCISSUS BULB FLY. ' 1' id its damage in home gardens LEAFLET NO. 444 Agricultural Research Service U.S. DEPARTMENT OF AGRICULTURE paiedeedif poi... Low Tilt LAMM U.S. DI AITAIIPIT OF MICULTURE
More informationWING AND TAIL MOLT OF THE SPARROW HAWK ERNEST J. WILLOUGHBY
WNG AND TAL MOLT OF THE SPARROW HAWK ERNEST J. WLLOUGHBY N the order Falconiformes, the family Falconidae is unique in that the molt of the primaries begins with the fourth primary and proceed simultaneously
More informationSelecting Laying Hens
Selecting Laying Hens Authors Thompson, R. B. Publisher College of Agriculture, University of Arizona (Tucson, AZ) Download date 26/04/2018 15:39:49 Link to Item http://hdl.handle.net/10150/196570 of COLLEGE
More information(Waksman and Woodruff, 1942) and streptomycin (Schatz, Bugie, and Waksman,
THE NFLUENCE OF STREPTOMYCN AND STREPTOTHRCN ON THE NTESTNAL FLORA OF MCE DOROTHY G. SMTH AND HARRY J. ROBNSON WTH THE TECHNCAL ASSSTANCE OF DOROTHY M. CLARK Merck nstitute for Therapeutic Research, Rahway,
More informationUNIVERSITEIT VAN PRETORIA UNIVERSITY OF PRETORIA !..._...,..~ YUNIBESITHI YA PRETORIA ~ Faculty of Ve!Brinary Science
100 0 UNVERSTET VAN PRETORA UNVERSTY OF PRETORA 1908 200!..._...,.. YUNBESTH YA PRETORA Faculty of Ve!Brnary Scence FACULTY DAY Faculty of Veternary Scence Unversty of Pretora 4 September 2008 Bref Hstory
More informationINDIVIDUAL IDENTIFICATION OF GREEN TURTLE (CHELONIA MYDAS) HATCHLINGS
INDIVIDUAL IDENTIFICATION OF GREEN TURTLE (CHELONIA MYDAS) HATCHLINGS Ellen Ariel, Loïse Corbrion, Laura Leleu and Jennifer Brand Report No. 15/55 Page i INDIVIDUAL IDENTIFICATION OF GREEN TURTLE (CHELONIA
More informationBiology of Citrus Trunk Borer (Anoplophora versteegi Rits.) (Coleoptera : Cerambycidae) under Laboratory Conditions
Biology of Citrus Trunk Borer (Anoplophora versteegi Rits.) (Coleoptera : Cerambycidae) under Laboratory Conditions Kanchan Saikia 1, N.S. Azad Thakur 1 and Alemla Ao 2 Abstract The male beetle of citrus
More information163. The Control o f Growth and Development in Bombyx mori. II Genic Balance in Molting Characteristics
No. 8] Proc. Japan Acad., 45 (1969) 733 163. The Control o f Growth and Development in Bombyx mori. II Genic Balance in Molting Characteristics By Seijiro MOROHOSHI Faculty of Agriculture, Tokyo University
More informationResearch Into Sex Linked Control of Bodyweight in Poultry and Rabbits
Research Into Sex Linked Control of Bodyweight in Poultry and Rabbits BY R. G. BEILHARV SUMMARY Sixteen weeks bodyweight from one progeny group of rabbits, and six weeks bodyweight from progeny groups
More informationEmerging Adults BROWARD COUNTY ELEMENTARY SCIENCE BENCHMARK PLAN. SC.F The student describes how organisms change as they grow and mature.
activity 27 Emerging Adults BROWARD COUNTY ELEMENTARY SCIENCE BENCHMARK PLAN Grade K Quarter 3 Activity 27 SC.F.1.1.3 The student describes how organisms change as they grow and mature. SC.H.1.1.1 The
More informationBiology 201 (Genetics) Exam #1 120 points 22 September 2006
Name KEY Section Biology 201 (Genetics) Exam #1 120 points 22 September 2006 Read the question carefully before answering. Think before you write. You will have up to 50 minutes to take this exam. After
More informationApplications KARL MALONE JOHN STOCKTON. a. What fraction benchmark is near the number of free throws made by each player?
Applications. In a recent year, Karl Malone made 474 out of 62 free-throw attempts and John Stockton made 27 out of 287 free-throw attempts. Copy the percent bars and use them to answer each question.
More informationUniversity of Canberra. This thesis is available in print format from the University of Canberra Library.
University of Canberra This thesis is available in print format from the University of Canberra Library. If you are the author of this thesis and wish to have the whole thesis loaded here, please contact
More informationThink you want a Dane?
Think you want a Dane? Great Danes are absolutely wonderful dogs, but they are not for everybody. We have developed this to help you decide if a Great Dane is the right dog for you. Basic Informaton Aout
More information2013 Holiday Lectures on Science Medicine in the Genomic Era
INTRODUCTION Figure 1. Tasha. Scientists sequenced the first canine genome using DNA from a boxer named Tasha. Meet Tasha, a boxer dog (Figure 1). In 2005, scientists obtained the first complete dog genome
More informationDefects, Structure and Breakage of Translocated Chromosome in the Sex-Limited Yellow Cocoon Strain of the Silkworm, Bombyx mori.
Defects, Structure and Breakage of Translocated Chromosome in the Sex-Limited Yellow Cocoon Strain of the Silkworm, Bombyx mori. By TAKAO NIINO Division of Silkworm Breeding, Sericultural Experiment Station
More informationWhy we have to cull Badgers to beat Bovine TB
BOVINE TUBERCULOSIS IN CATTLE AND IN BADGERS Why we have to cull Badgers to beat Bovine TB Compiled By The Women s Food and Farming Union (WFU) November 2010 A Trilogy of Information Tier One Younger,
More informationDurham E-Theses. Grant, Murray C
Durham E-Theses The breeding ecology of whimbrel (Numenius Phaeopus) in Shetland: with particular reference to the eects of agricultural improvement of Heathland nesting habitats Grant, Murray C How to
More informationexamnined when three weeks old. Not one of the eyes showed
A NOTE ON THE DOG'S TAPETUM IN EARLY LIFE* BY C. H. USHER ABERDEEN THIS note is written for the purpose of pointing out that the tapetum of the dog is not recognizable ophthalmoscopically for several weeks
More informationWelcome to the case study for how I cured my dog s doorbell barking in just 21 days.
Welcome to the case study for how I cured my dog s doorbell barking in just 21 days. My name is Chet Womach, and I am the founder of TheDogTrainingSecret.com, a website dedicated to giving people simple
More informationThe effects of diet upon pupal development and cocoon formation by the cat flea (Siphonaptera: Pulicidae)
June, 2002 Journal of Vector Ecology 39 The effects of diet upon pupal development and cocoon formation by the cat flea (Siphonaptera: Pulicidae) W. Lawrence and L. D. Foil Department of Entomology, Louisiana
More informationTHE INFLUENCE OF VARIATIONS IN THE IN THE EWE ARTHUR WILLIAM LISHMAN. B.Sc. Agric. (Natal), M.Sc. Agric. (Natal)
THE NFLUENCE OF VARATONS N THE LEVEL OF NUTRTON ON REPRODUCTON N THE EWE by ARTHUR WLLAM LSHMAN B.Sc. Agric. (Natal), M.Sc. Agric. (Natal) A thesis submitted in partial fulfilment of the requirements for
More informationSIMPLE U.V. SPECTROPHOTOMETRIC METHODS FOR THE ESTIMATION OF OFLOXACIN IN PHARMACEUTICAL FORMULATIONS
Int. J. Chem. Sci.: 8(2), 2010, 983-990 SIMPLE U.V. SPECTROPHOTOMETRIC METHODS FOR THE ESTIMATION OF OFLOXACIN IN PHARMACEUTICAL FORMULATIONS C. SOWMYA *, Y. PADMANABHA REDDY, J. RAVINDRA REDDY, M. SIVA
More informationCOLLIE ROUGH DOGS. CLASS 1 Baby Puppy Dog
COLLIE ROUGH DOGS CLASS 1 Baby Puppy Dog 1. CATHGARRY RUMOURS TO GO Beautiful blue merle puppy. Balanced head and body, beautiful blue merle colour, lovely expression. Nicely presented. There should not
More information3.2. Further research is required to ensure this weight data is an accurate representation of the performance of both breeds.
To establish whether there are differences in performance between 757 (Lloyd Maunders) birds and the Maurice Millard 257 those currently used within the Sheepdrove system Vanessa Pegg, Claire Aspray &
More informationLINKAGE OF ALBINO ALLELOMORPHS IN RATS AND MICE'
LINKAGE OF ALBINO ALLELOMORPHS IN RATS AND MICE' HORACE W. FELDMAN Bussey Inslitutim, Harvard Univwsity, Forest Hills, Boston, Massachusetts Received June 4, 1924 Present concepts of some phenomena of
More informationPhenothiazine-Salt Mixture Free Choice,
Phenothiazine-Salt Mixture Free Choice, for the Control of the Large Stomach Worm in Range Sheep An 8-year Study Conducted Under the Naturak Range Conditions of the Edwards Plateau DGEST An 8-year study
More informationINFLUENCE OF FEED QUALITY ON THE EXPRESSION OF POST WEANING GROWTH ASBV s IN WHITE SUFFOLK LAMBS
INFLUENCE OF FEED QUALITY ON THE EXPRESSION OF POST WEANING GROWTH ASBV s IN WHITE SUFFOLK LAMBS Introduction Murray Long ClearView Consultancy www.clearviewconsulting.com.au Findings from an on farm trial
More informationProblem of the Month. Fractured Numbers. Rosita has made a puzzle. She takes a whole rectangle like the one below.
Level A Problem of the Month Fractured Numbers Rosita has made a puzzle. She takes a whole rectangle like the one below. She cuts the whole into half. She takes that half and cuts it in half. Finally she
More information