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SAT® Subject Test in Biology

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Moderate

Types of Selection III

SATBIO-HTUKNV

A group of researchers studying the effect of severe thunderstorms on wing length in songbirds. The researchers hypothesize that in areas where severe storms are common, songbirds with short wings are more likely to survive the high gusting winds and thus are selected for, making them more frequent in the population.

The researchers notice that in the Midwest, a certain species of songbird is found to have far more short winged birds in the population than long or medium winged birds.

The type of natural selection operating on this bird population is

A

sexual selection.

B

directional selection.

C

stabilizing selection.

D

disruptive selection.

E

convergent evolution.