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balanced polymorphism |
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polymorphism /poly·mor·phism/ (-mor´fizm) the quality of existing in several different forms. balanced polymorphism an equilibrium mixture of homozygotes and heterozygotes maintained by natural selection against both homozygotes.
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. 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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burgdorferi are polymorphic (19), and balancing selection seems to maintain the bacterium's diversity (20). Mix-match favoritism, called balancing selection, also shows up in sickle-cell anemia. In the case of haploid organisms such as bacteria, balancing selection would take the form of frequency-dependent selection rather than overdominant selection. |
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