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: -The reproductive success of individual males increases with the number of mates. Thus, males often achieve greater reproductive success by competing with other males to access as many females as possible. Females invest more in each individual offspring and thus cannot produce as many offspring as males.

Detailed explanation-3: -He recognized two mechanisms of sexual selection: intrasexual selection, or competition between members of the same sex (usually males) for access to mates, and intersexual selection, where members of one sex (usually females) choose members of the opposite sex.

Detailed explanation-4: -Examples of male-male competition include the dramatic head butting by male bighorn sheep and fights between roost-ers. Male elk use elaborate antlers to lock and push one another during the mating season, vying for access to females.