Directional selection in the modern horse is demonstrated by
A) the gradual decrease in size over time.
B) the rapid decrease in size over time.
C) the gradual increase in size over time.
D) the rapid increase in size over time.
E) the extinction of other horse species.

Question

Quizplus · Accepted Answer

The modern horse is significantly larger than its ancestral counterparts, indicating a gradual increase in size over time due to selective pressure favoring larger individuals. This is an example of directional selection, which favors individuals at one extreme of the phenotypic distribution.

Directional Selection in the Modern Horse Is Demonstrated by