AP BIOLOGY

Detailed explanation-1: -One example of disruptive selection is dark and light-colored oysters. Both dark-colored oysters and light-colored oysters have camouflage advantages. Light-colored oysters will blend with the rocks and dark-colored oysters can hide under the rock shadow.

Detailed explanation-2: -Natural selection on polygenic traits can affect the distributions of phenotypes in three ways: directional selection, stabilizing selection, or disruptive selection.

Detailed explanation-3: -The result of stabilizing is the over-representation in a specific trait. For example, the coats of a species of mice in a forest will all be the best color to act as camouflage in their environment. Other examples include human birth weight, the number of eggs a bird lays, and the density of cactus spines.

Detailed explanation-4: -Stabilizing Selection When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection. For example, plant height might be acted on by stabilizing selection. A plant that is too short may not be able to compete with other plants for sunlight.