AP BIOLOGY

EVOLUTION

DARWIN’S THEORY OF NATURAL SELECTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When individuals with an average form of a trait have the highest fitness, the result is
A
not predictable
B
disruptive selection
C
directional selection
D
stabilizing selection
Explanation: 

Detailed explanation-1: -Stabilizing selection selects against individuals with extreme traits and favors individuals with average traits. Stabilizing selection drives the population towards average traits.

Detailed explanation-2: -Stabilizing selection (not to be confused with negative or purifying selection) is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value.

Detailed explanation-3: -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.

Detailed explanation-4: -Disruptive selection: Both extreme phenotypes have a higher fitness than intermediate phenotypes.

There is 1 question to complete.