Talk:Overdominance

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The definition given in the intro is not completely correct. Overdominance is not necessarily related to fitness. It simply means that the heterozygote's phenotype lies outside the range of the two parental homozygotes (either above or below); this may be against the direction of fitness. In addition, a heterozygote may still be fitter than either of the two parents, even if its phenotype lies somewhere between the two parents. The definition in the intro is only correct in cases where the phenotype studied is fitness itself. --Crusio 16:39, 11 November 2007 (UTC)