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All-female hybrid fish species ?uses? males for better genetics

Some species are comprised of female-only members, giving themselves a competitive advantage over species that produce both male and female offspring. Since the females are capable of bearing offspring, they can quickly outnumber other species in which half the population – the males – do not. However, these all-female species are disadvantaged due to a lack of variety in their gene composition.
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(Hokkaido University) A hybrid species of all-female fish in the north Pacific Ocean may have survived for an uncharacteristically long period of time by switching mating species.

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