Assortative

Again it is up to the assortative breeder to know what sort of traits, both positive and negative, exist within the diversity of one breeding.

An important question in the epidemiology of sexually transmitted infections is whether or not these groups copulate mostly at random (with sexual partners from throughout a population) or within their social groups ( assortative mixing ).

Inbreeding is used to reveal deleterious recessive alleles, which can then be eliminated through assortative breeding or through culling.

This led to disruptive selection —competition favoring fishes at either extreme of body size and mouth size over those nearer the mean, as well as assortative mating —each size preferred mates like it.