Dictionary of Human Evolution and Biology

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Superiority of a heterozygous genotype(s) with respect to one or more characters without an increase in fitness, compared to the homozygotes for the same genetic locus or loci; produced by matings of homozygotes from different geographic regions. Results in greater genetic variability in the F1 offspring. In humans, heterosis can also result in greater cultural variability in these offspring. Aka hybrid vigor, and luxuriance.

Cf. heterozygote superiority and overdominance.

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