AP BIOLOGY

Detailed explanation-1: -The correct answer is: Disruptive selection.

Detailed explanation-2: -Why do you think the average beak depth of the birds increased? Because the drought reduced the number of seeds and finches with bigger beaks were able to eat the larger and harder seeds so more of them survived.

Detailed explanation-3: -Stabilizing selection results in a decrease of a population ‘s genetic variance when natural selection favors an average phenotype and selects against extreme variations. In directional selection, a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes.

Detailed explanation-4: -❍ Stabilizing selection is defined as a type of natural selection that favors the propagation of the average or intermediate phenotype in a population, while actively selecting against the extreme phenotypes. It favors the major phenotype in a population that is well adapted to the environment.