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Related to Overdominance hypothesis: Outbreeding Enhancement


The condition of a heterozygote having a phenotype that is more pronounced or better adapted than that of either homozygote.

o′ver·dom′i·nant adj.


excessive dominance
References in periodicals archive ?
Allozyme and RFLP heterozygosities as correlates of growth rate in the scallop Placopecten magellanicus: a test of the associative overdominance hypothesis.
The inability to distinguish between the selection hypothesis and the associative overdominance hypothesis is primarily due to the fact that both explanations make a number of remarkably similar predictions (Charlesworth 1991; Zouros 1993; Houle 1994; however, see David 1997).
Under inbreeding effects, a significant positive slope is expected, which is not predicted under the overdominance hypothesis (examples in Table 1).