1. We have been learning about natural selec+on. Write down AT LEAST two facts you can remember about it.

Transcription

1 Warm up (3 minutes) 1. Pick up a warm up 2. Pick up the student work from the front table 3. Pick up your binder in the filing cabinet 4. Complete the warm up 1. We have been learning about natural selec+on. Write down AT LEAST two facts you can remember about it. 2. Have you completed your Unit Lab (Natural SelecCon simulacon), due tomorrow?

2 Living Environment: Nature s Sustainable Design FOCUS QUESTION: Can we observe and measure natural selection? Topic 5.6 Beaks of Finches, p. 19 Today s Plan: 1. Warm Up & Review (3 min) 2. The Beak of the Finch movie and note taking 3. The Beak of the Finch Quiz 4. Exit Slip (5 min) Today s Objective: You will analyze the Grants research on the beak sizes on the Galapagos Finches. 2

3 Part 1: The Beak of the Finch Movie Direc&ons: As you watch the 15 min movie, take notes in the box provided about the most important informa&on from the film.

4 Part 2: The Beak of the Finch QUIZ

5 Part 2: The Beak of the Finch QUIZ REVIEW 1. About how many years have the Grants been conduccng research on the Galapagos finches? 40 years (since 1973) 2. The finches beaks are different shapes and sizes. What purpose does this serve? It allows the finches to eat different types of foods without having to compete. For example, the warbler finch with a needle- like beak eats insects, and the ground finch eats seeds. They don t compete for food. It allows them The right tool for the right job

6 3. Which is the most likely explanacon for the presence of 13 different finch species on the Galapagos Islands today? Circle your choice (A or B) below. A. Many years ago several different species of birds migrated to the Galapagos islands and the 13 species that currently live there are the only species that survived. B. Many years ago a small populacons of a single bird species migrated to the islands and evolved into the 13 species that live on the islands today. 4. Different finch species have beaks of different shapes and sizes. These different beak structures are evidence of: (choose A, B, or C) A. Different finch species adapcng to different environments over many generacons B. Different finch species with different beak structures coming to the Galapagos Islands from the mainland C. Individual birds changing their beak characterisccs so that they could feed efficiently.

7 5. Imagine you are studying a populacon of finches on one of the Galapagos Islands. You have been recording many of the birds physical traits, including the length of both wings. You observe that for 80% of individuals measured, the length of the leg wing is not significantly different from the length of the right wing (in other words, they are symmetrical). But for about 20% of birds measured the wing lengths are asymmetrical. This distribucon is true from generacon to generacon. Suddenly, a rare 5- day windstorm takes over the island. Ager the storm, you spend the next several days nehng each bird on the island that survived the storm. You discover that 85% of the birds with symmetrical wings survived the storm, whereas only 5% of the birds with asymmetrical wings did. A. Write a hypothesis to explain this observacon. B. If such storms become increasingly common due to changes in climate, how might you expect the populacon to change over Cme with respect to wing symmetry?

8 6. a. Make 2 observacons about the distribucon of beak depth measures in this sample of 200 medium ground finches. b. What is the most common beak depth of the finches living on Daphne Major in 1976? 8.8 mm c. What is the range of beak depths in this group of medium ground finches? mm

9 How does natural seleccon help explain how the Ancestor Finch in the image below developed into THREE DIFFERENT SPECIES? Use specific examples from today s lesson!

10 Finish Natural Selec<on Labs!

11 Your Future is in Your hands Living Environment: Nature s Sustainable Design Announcements Unit Lab Packets are due TOMORROW! 11

12 Exit Slip (5 minutes) 1. Give at least TWO REASONS why there are so many different species of finches in the Galapagos Islands. Use your notes from the movie and quiz ques&ons to help you.