AP BIOLOGY

Detailed explanation-1: -When individuals with intermediate phenotypes are favoured and extreme phenotypes are selected against, the selection is said to be stabilizing.

Detailed explanation-2: -Answer and Explanation: The only choice that would favour intermediate phenotypes of a species over extreme phenotypes within a particular population is stabilizing selection.

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.

Detailed explanation-4: -Each type of selection contains the same principles, but is slightly different. Disruptive selection favors both extreme phenotypes, different from one extreme in directional selection. Stabilizing selection favors the middle phenotype, causing the decline in variation in a population over time.

Detailed explanation-5: -In stabilizing selection, traits that create “extreme” phenotypes are selected against, while those that produce “intermediate” or “average” phenotypes are selected for.