AP BIOLOGY

Detailed explanation-1: -Sexual selection is a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex (intrasexual selection).

Detailed explanation-2: -Evolution by sexual selection has been invoked to explain a number of human anatomical features, which appear useless or detrimental to human survival. These include hairlessness, male facial hair, rounded breasts, pubic hair, and penis size.

Detailed explanation-3: -Sexual selection is not a subcategory of natural selection, as Darwin made very clear: it arises from differences in mating success, whereas natural selection is due to variance in all other fitness components. This simple delineation comes closest to Darwin’s concepts and distinctions.

Detailed explanation-4: -Unlike males, females often compete more intensely for resources necessary for successful reproduction than for access to mating partners and the development of secondary sexual characters in females may be limited by costs to fecundity rather than to survival.