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DictionarySeepolymorphismbalanced polymorphism
balanced polymorphism[′bal·ənst ¦päl·i′mȯr‚fiz·əm] (genetics) Maintenance in a population of two or more alleles in equilibrium at frequencies too high to be explained, particularly for the rarer of them, by mutation; commonly due to the selective advantage of a heterozygote over both homozygotes. balanced polymorphism
polymorphism [pol″e-mor´fizm] the ability to exist in several different forms.balanced polymorphism an equilibrium mixture of homozygotes and heterozygotes maintained by natural selection against both homozygotes.genetic polymorphism the occurrence together in the same population of two or more genetically determined phenotypes in such proportions that the rarest of them cannot be maintained merely by recurrent mutation.single nucleotide polymorphism (SNP) a genetic polymorphism between two genomes that is based on deletion, insertion, or exchange of a single nucleotide.bal·anced pol·y·mor·phisma unilocal trait in which two alleles are maintained at stable frequencies because the heterozygote is more fit than either of the homozygotes.
See also: overdominance. bal·anced pol·y·mor·phism (bal'ănst pol'ē-mōr'fizm) A unilocal trait in which two alleles are maintained at stable frequencies because the heterozygote is more fit than either of the homozygotes.
See also: overdominancebalanced polymorphism or stable polymorphism a GENETIC POLYMORPHISM in which the various morphs are maintained in a stable frequency over several generations due, possibly, to constant NATURAL SELECTION pressures. |