Question

which type of natural selection selects for one of two extreme phenotypes of a polygenic trait in a population?
a directional selection
b stabilizing selection
c disruptive selection

Explanation:

Directional selection favors one of the extreme phenotypes of a polygenic trait in a population. Stabilizing selection favors the intermediate phenotype. Disruptive selection favors both extreme phenotypes over the intermediate.

Answer:

A. directional selection