Which of the following statements about natural selection are true?

A) Directional selection occurs when one extreme phenotype in the population is favored.
B) Stabilizing selection favors all phenotypes equally.
C) Disruptive selection favors two extreme phenotypes.
D) Directional selection is most common in stable environments.


A, C

Two of the statements are true. Directional selection occurs when one extreme phenotype has an adaptive advantage. Disruptive selection favors two extreme phenotypes. Stabilizing selection does not favor all phenotypes equally, instead it favors an intermediate phenotype and selects against the extreme phenotypes. Directional selection is more common in changing environments.

Biology & Microbiology

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