Final answer:
Sexual selection is stronger in males than in females because access to mates is limiting for males but not females. In many species, males compete for access to mates, while females are choosy about their mates. This competition and choosiness result in stronger sexual selection in males.
Step-by-step explanation:
Sexual selection is stronger in males than in females because access to mates is limiting for males but not females.
Sexual selection occurs when one sex has more reproductive success than the other, leading to differences in selective pressures between the sexes. In many species, males compete for access to mates, while females are choosy about their mates. This competition and choosiness result in stronger sexual selection in males.
For example, male birds often have elaborate plumage and engage in courtship displays to attract females. This is an example of intersexual selection, where females choose mates based on certain traits. Intrasexual selection also occurs as males compete with each other for access to mates, such as in battles between male rams.