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. This entire week has been about natural selection. Write down AT LEAST two facts pertaining to natural selection.

2. How do you plan on finishing your Peppered Moth lab due tomorrow?

*Write in complete sentences*

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Topic 5.6

Beaks of Finches,

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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.

FOCUS QUESTION: How could new species of

finches form on an island?

Part 1: The Beak of the Finch Movie Directions: As you watch the 15 min movie, take notes in the box provided about the most important information from the film.

Part 2: The Beak of the Finch QUIZ

Part 2: The Beak of the Finch QUIZ REVIEW

1. About how many years have the Grants been conducting 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”

3. Which is the most likely explanation 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 populations 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 adapting to different environments over many generations B. Different finch species with different beak structures coming to the Galapagos Islands from the mainland C. Individual birds changing their beak characteristics so that they could feed efficiently.

5. Imagine you are studying a population 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 left 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 distribution is true from generation to generation. Suddenly, a rare 5-day windstorm takes over the island. After the storm, you spend the next several days netting 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 observation. B. If such storms become increasingly common due to

changes in climate, how might you expect the population to change over time with respect to wing symmetry?

a. Make 2 observations about the distribution 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? 7.3-10.8 mm

6.

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

Finish Natural Selection Labs!

Living Environment: Nature’s Sustainable Design

• Labs due tomorrow.

• NYS Lab: Beaks of Finches tomorrow and Monday. DO NOT miss it.

• Marking Period ends next week.

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Announcements

Exit Slip (5 minutes)

1. Explain how new finch species arose (came to be) on the Galapagos Islands.

Use your notes from the movie and quiz questions to help you.

*At least two sentences*