balanced polymorphism


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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·phism

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: overdominance.

balanced polymorphism

in a population, the occurrence of a certain proportion of homozygotes and heterozygotes for specific genetic traits, which is maintained from generation to generation by the forces of natural selection. Compare genetic polymorphism.

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: overdominance

balanced 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.

polymorphism

the quality of existing in several different forms.

balanced polymorphism
an equilibrium mixture of homozygotes and heterozygotes maintained by natural selection against both homozygotes.
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