NEET BIOLOGY

Detailed explanation-1: -Sexual dimorphism (conspicuous differences between the two sexes) result from non-random mating. The process is a special case of natural selection known as sexual selection. Sexual selection may serve as a barrier to reproduction between closely similar species.

Detailed explanation-2: -Sexual selection is defined as natural selection occurring because of preference by one sex for certain characteristics in individuals of the other sex. In its strictest sense, sexual selection is not the same as the non-random mating we have described above because it does not involve differential reproduction.

Detailed explanation-3: -NONRANDOM MATING/INBREEDING 13–16, 59-63, 198-205 •Will distinguish two types of nonrandom mating: (1) Assortative mating: mating between individuals with similar phenotypes or among individuals that occur in a particular location. (2) Inbreeding: mating between related individuals.

Detailed explanation-4: -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-5: -One of the most common forms of non-random mating is inbreeding, where offspring are produced by individuals that are closely related.