Name Period Date

Procedures

1. Examine the different tools ("beaks") and seeds provided. Predict which "beak" will be the

most successful at picking up small seeds. Give the reasons for your choice.

2. Predict which "beak" will be the least successful at picking up small seeds. Give the reasons for

your choice.

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3. From this point on, you and your partner will model a finch feeding. The tool you were assignedwill be your "beak." Describe what characteristics it has that make it good for picking up smallseeds. In the remaining space or on a separate sheet, draw an outline of your assigned "beak."

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Name Period Date

5-6. Round One: Feeding with No Competition

7. Round Two: Feeding with Competition

D Original island (small seeds) [J New island (large seeds)

9. Round Three: Feeding with Increased Competition

D Original island (small seeds) [J New island (large seeds)

Seeds Collected

Partner #1 Trial #1

Trial #2

Partner #2 Trial #3

Trial #4

Average

Seeds Collected

Partner #1 Trial #1

Trial #2

Partner #2 Trial #3

Trial #4

Average

Seeds Collected

Partner #1 Trial #1

Trial #2

Partner #2 Trial #3

Trial #4

Average

Name Period Date

Analysis Questions

1. What characteristics of your "beak" interfered with feeding success on the original island?

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2. Name three traits other than beak characteristics that could contribute to the ability of a finch tocompete successfully.

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3. It is very unlikelythat all of the beaks withina speciesof finch are exactlyalike.Random mutationsand new gene combinations resulting from sexual reproduction are the source of beak variations.Describe at least three beak variations that could randomly appear and further improve yourspecies' chances of survival when feeding on small seeds.

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4. Why did some "beak" types survive on the new island (with large seeds) when they could notsurvive on the original island?

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5. Class Activity: Complete the Class Results data table on the last page of this laboratory activitybefore going on to the remaining questions.

6. Did those who were successful in Round One survive equally well when others were competingfor foodat the samedishduringRoundTwo?~w~w~ Supportyouranswerwithan explanation.

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7. Why were there fewer survivors at the end of Round Three?

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Name Period Date

8. At the end of Round Three, were the types of "beaks" that were successful on the new islandthe sameas the typesof beaksthatweresuccessfulon the originalisland?""'.nn Supportyour answer with an explanation.

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9. Explain how this activity simulates each of the concepts listed below as they are involved in theprocess of natural selection. Describe a specific example from this laboratory for each concept.variation:-_O@--competition:

strugglefor survival: _ow ._---

adaptation:

environment:nO_On'

selecting agent:

Base your answers to questions 10-12 on Figure 1, which shows various finches found on the

Galapagos Islands, and on your knowledge of biology.

SmallGround

FinchLarge Tree

Finch

Sharp-billedGroundFinch

- from Galapagos: A Natural History Guide

Figure 1. Variations in Beaks of Galapagos Islands Finches

Name Period Date

10. Predict which species of finch would be most likely to survive if the weather on the Galapagos

Islandsgraduallychangedand the seedsavailableto the finchesbecamelargerwithheaviercoverings.Supportyour answerwith an explanation.

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11. One island is populated by two species-Small Ground Finches and Small Tree Finches.

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b. Would you expect the two species to compete for food on this island? Support your answer

with an explanation.

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c. How might the two native finch populations be affected if several dozen Sharp-billed GroundFinches were to migrate to the island and survive? Support your answer with an explanation.

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12. a. Explain how an island could support large populations of both Large Ground Finches andSmall Ground Finches.

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TWI

Name Period Date

Class Results

Beaks That Were Number of Characteristics of BeaksBeak Types (Size and Shape)

Present at the beginning of the activity

Successful at feeding in Rou,:ldOneon the original island-fed on small seeds,did not need to migrate

Not successful at feeding in Round Oneon the original island-fed on small seeds,had to migrate to the new island

Successful at feeding in Round Twoon the original island-fed on small seeds

Successful at feeding in Round Twoon the new island-fed on large seeds

Not successful at feeding in Round Twoon either island-species dies out

Successful at feeding in Round Threeon the original island-fed on small seeds

Successful at feeding in Round Threeon the new island-fed on large seeds

Not successful at feeding in Round Threeon either island-species eliminated