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Dominance variance (VD) is a special type of variation which is found in populations containing dominant and recessive alleles for a particular gene. Because dominant phenotypes are expressed by all genotypes possessing one or more dominant alleles, while recessive phenotypes are expressed only when both alleles are recessive, this creates a difference between variation in genotype and variation in phenotype, which can affect natural selection.
This page is part of the EvoWiki encyclopedia of genetics and molecular biology.