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a)Given that beak size in mature adults does not change, what factor is driving the change in average beak size in Galápagos finches over time? Seed number Seed size Rainfall amounts Both b. and c. All of the above.

a)Given that beak size in mature adults does not change, what factor is driving the change in average beak size in Galápagos finches over time? Seed number Seed size Rainfall amounts Both b. and c. All of the above.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Review the following figure, and then answer the two questions that follow.

 

a)Given that beak size in mature adults does not change, what factor is driving the change in average beak size in Galápagos finches over time?

  1. Seed number
  2. Seed size
  3. Rainfall amounts
  4. Both b. and c.
  5. All of the above.

 

b)What would you predict about beak size if the Galápagos experiences a wet year?

  1. More birds with small beaks will survive
  2. More birds with large beaks will survive
  3. Both a. and b.

All of the above

GALÁPAGOS FINCHES: FOOD SUPPLY AND BEAK SIZE Drought Drought 10.0 Drought 9.8 9.6 In dry years, finches had to eat large, hard seeds, and bigger beaks were selected for. 9.4 Unusually wet year 9.2 9.0 1976 1978 1980 1982 1984 Year In wet years, finches could eat small, soft seeds, and smaller beaks were selected for. O Adaptation does not march toward an optimal endpoint. Average beak size within a population continues to fluctuate according to food supply. Average beak size (mm)
Transcribed Image Text:GALÁPAGOS FINCHES: FOOD SUPPLY AND BEAK SIZE Drought Drought 10.0 Drought 9.8 9.6 In dry years, finches had to eat large, hard seeds, and bigger beaks were selected for. 9.4 Unusually wet year 9.2 9.0 1976 1978 1980 1982 1984 Year In wet years, finches could eat small, soft seeds, and smaller beaks were selected for. O Adaptation does not march toward an optimal endpoint. Average beak size within a population continues to fluctuate according to food supply. Average beak size (mm)
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