Dictionary of Human Evolution and Biology

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Polymorphism

1. any trait that varies in a population or set.

2. any discrete genetic trait, such as a blood group, in which there are at least two alleles at a locus each having frequencies greater than 1%, aka a genetic polymorphism; Cf. monomorphic.

3. the co-occurrence of several different forms of a trait, such as a chromosomal polymorphism or transient polymorphism.

See balanced polymorphism.

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