Heredity B Station 1. Examine the following karyotype.

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1 Heredity B Station 1 Examine the following karyotype. 1. What gender is this individual? a. male b. female c. indeterminate d. you cannot tell from this type of diagram 3. Which is true about this karyotype? a. It is of an adult human b. It is of a still born fetus c. It is genetically normal d. It has more chromosomes than it should 2. What kind of cell could these DNA strands have come from? a. sperm cell b. unfertilized egg cell c. red blood cell d. skin cell 4. Which genetic disorder is most similar to this karyotype? a. Down's Syndrome b. Hemophilia A c. Turner's Syndrome d. Fragile X Syndrome

2 Heredity B Station 2 Examine the following diagram, which shows the process by which genetic material is packaged to fit in eukaryotic cells. 5. Which structure is called chromatin? a. A b. B c. C d. D 7. What are the telomeres? a. the bnckbone of structure A b. the centers of the B structures c. where the two parts of structure D connect d. the very tips of structure D 6. What material makes up structure B? a. nucleic acids b. sugars c. proteins d. lipids 8. The multicolored nature of structure A is meant to show... a. the different DNA bases b. hexagonal vs. pentagonal sugars c. methylated and demethylated sections of DNA d. chromosomes inherited from different relatives

3 Heredity B Station 3 Examine the following pedigree, showing in black individuals with a genetic disorder. 9. What does the partially-filled circle mean? a. a person of indeterminate gender b. a person who is affected by the disorder, but has not died from it c. a person who does not have the disorder, but could pass it on to their child(ren) d. woman 10. There is a man marked by a question mark. Assuming this disorder allows normal fertility and a lifespan to at least childbearing age, does this man have the disorder? a. yes b. no c. you cannot tell from this diagram 11. What is the nature of this genetic disorder? a. dominant b. recessive c. X-linked d. Y-linked 12. There is a mistake on this pedigree chart. Find it! a. someone is both male and female b. brother and sister appear to be married c. a lady appears to have children without need for a father d. it is upside down

4 Heredity B Station 4 Examine the following diagram, which shows a Punnett square for a child who knows his father's hair texture (wavy), but not his mother's hair texture. In this example, S1 represents the gene that makes a straight form of keratin, with more beta-pleated sheets. S2 represents the gene that makes a spiral form of kertain, with more alpha-helices. 13. What is the relationship between these two genes? a. dominant and recessive b. codominant c. linked d. you cannot tell 14. Why are the father's S1 and S2 genes labeled across two separate boxes? a. he has a 50/50 chance of passing down either gene b. each sperm cell has either the S1 gene or the S2 gene c. the gene can combine with one other gene to make a baby with the correct number of hair texture genes d. all are true! 15. What is the boy's probability that he inherited wavy hair? a. 25%, or 1 in 4 chance b. 50%, or 2 in 4 chance c. 100%, or 4 in 4 chance d. you cannot tell without more information about the mother 16. If the child has a half-sibling on his mother's side with curly hair, what would his mother's hair texture genes be? a. S1S1 b. S1S2 c. S1 only d. you cannot tell from this information

5 Heredity B Station 5 Read the following explanation of a multiple-gene system: coat color in Labrador retriever dogs. These popular dogs have four fur colors: black, chocolate (brown), yellow, and white (blonde). 1. The eumelanin E/e gene determines if the dog makes dark color pigment. If the dog has a dominant E, it will be black or chocolate. If the dog does not, it will be yellow or light yellow. 2. The brown B/b gene determines black versus chocolate, with black being the result of the dominant B gene. 3. The yellow C/c gene determines yellow versus light yellow, with yellow being the result of the dominant C gene. 17. Your neighbor has a yellow lab, Sasha. If her mother was a white lab, what could her eumelanin genes be? a. EE b. ee c. Ee d. you cannot tell 19. Which coat color could Sasha's father NOT have been? a. white b. yellow c. chocolate d. black 18. What are Sasha's B/b genes like?? a. BB b. Bb c. bb d. you cannot tell 20. Sasha has a litter of puppies, and they come in all colors.! What color can the father dog NOT be? a. white b. yellow c. chocolate d. black

6 Heredity B Station 6. Read the following explanation of a multiple-gene system: freckles. Early researchers on freckles studied people in northern Europe, particularly Ireland, Scotland, and England. Many times, when one parent had freckles and the other did not, children would be freckled. Freckled children were not born into freckle-less families, but freckle-less children were sometimes born into freckled ones. However, none of their subjects easily got a suntan. Later researchers discovered three proteins pheomelanin, which is found in freckles, and eumelanin, which is found in suntans. A third protein converts pheomelanin into eumelanin when a person is out in the sun. None of the northern Europeans originally studied had this third protein. 21. What gene code could be used for a person who makes pheomelanin? a. F b. f c. Ff d. ff 23 A person who can make a suntan... a. must make the conversion protein b. must be homozygous recessive for pheomelanin c. cannot pass that trait to their offspring d. all of these! 22. Geneticists would say the non-freckled northern Europeans had a form of the pheomelanin gene a. junk DNA b. X-linked c. dominant d. recessive 24. The lack of pheomelanin to eumelanin conversion gene persisted in the northern Europeans because... a. skin cancer is common in their environment, but affects people after the reproductive age b. light skin allows sunlight through for Vitamin D prodcution c. the gene is linked to desirable malaria resistance d. it only affects men