Integration of natural selection across the life cycle stabilizes a marine mussel hybrid zone.

A G ‐test of independence showed that the relationship between allele frequency a size was highly significant ( G 1,3 = 51.5, p < .001).

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Overall, these studies suggest that in nature, where sperm competition is expected to be present, there may be significant positive assortative mating that could yield an appreciable heterozygote deficiency.

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