The bright red breasts of male robins is likely the result of _____ selection.
A)intrasexual
B)intersexual
C)directional
D)stabilizing
E)disruptive

Question

Quizplus · Accepted Answer

Intersexual selection refers to selection driven by the preferences of individuals of the opposite sex. In this case, female robins may have a preference for males with bright red breasts, leading to the evolution of this trait. Intrasexual selection refers to selection driven by competition between individuals of the same sex, directional selection leads to an increase in the frequency of one extreme phenotype, stabilizing selection favors intermediate phenotypes, and disruptive selection favors extreme phenotypes at both ends of the distribution. None of these explanations fit the case of male robin breast color.

The Bright Red Breasts of Male Robins Is Likely the Result