Refer to the Figure

question 8

Multiple Choice

Refer to the figure.
The figures show the distribution of beak sizes in Galápagos medium ground finches (Geospiza fortis) before and after a year of extreme drought that reduced the availability of seed types most easily accessed by birds with pre-drought bills. Which of the following statements is true?

• A) Between 1976 and 1978, mean beak depth increased by approximately 30%, which is an example of disruptive selection.
• B) Between 1976 and 1978, mean beak depth increased by approximately 10%, which is an example of directional selection.
• C) Between 1976 and 1978, mean beak depth increased by approximately 10%, which is an example of stabilizing selection.
• D) Between 1976 and 1978, mean beak depth did not change significantly, but variance increased, as expected for disruptive selection.

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