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Note that all related outbred progeny are related to these grandparents through their common sire.
The first hypothesis predicts that outbreeding species should possess more genetic variation within a population and that inbreeding species show less variation within and more between populations.
In addition, the ratio of the metapopulation levels of genetic diversity in inbreeding vs. outbreeding species can also be heavily influenced by the structure of the populations.
The fitness consequences of inbreeding and outbreeding have intrigued biologists for a long time.
I used to suppose that finding the right balance between inbreeding and outbreeding , minimising the costs of both, is best achieved by careful mate choice.
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