nonrandom mating


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as·sort·a·tive mat·ing

selection of a mate with preference for (or aversion to) a particular genotype, that is, nonrandom mating.
Synonym(s): nonrandom mating

nonrandom mating

any mating in a population where crosses between the various types of individuals do not occur in the frequencies that are expected by chance. Two major types of nonrandom mating can be distinguished: between individuals that are related (see INBREEDING), and between individuals with similar phenotypes (see ASSORTATIVE MATING).
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The sign and magnitude of the difference between observed and expected heterozygosity within a population can be interpreted as the consequences of nonrandom mating within populations.
limited migration), nonrandom mating (inbreeding or outcrossing), genetic drift, and natural selection all lead to deviations from the simple predictions.
The term "inbreeding" is typically used to refer to a specific form of nonrandom mating within populations, more precisely "pedigree inbreeding"--the probability that the two alleles of a diploid individual can be traced to a single ancestor.
Factors contributing to low effective population size include large fluctuations in census population size that produce genetic "'bottlenecks," high variance in reproductive success among individuals, skewed sex ratios, high genetic load, stochastic environmental variation, small-scale spatial structure or other factors that result in nonrandom mating.