Nonrandom Mating
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Nonrandom mating changes genotype frequencies when individuals do not pair at random, whether from mate preference or unequal access to partners.
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Assortative mating, where individuals preferentially mate with phenotypically similar partners, is one common form of nonrandom mating.
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Nonrandom mating changes genotype frequencies specifically — it does not, by itself, change underlying allele frequencies in the gene pool.
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