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Outbreeding


outbreeding depression A reduction in the fitness of offspring resulting from matings among individuals from different populations or demes, possibly caused by the breaking up of coadapted gene complexes.
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For example, including the complete genetic dynamics of in- and outbreeding might lead to completely different conclusions in the above-mentioned theories of the adaptive nature of racism.
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Genetic variability is promoted by outbreeding: sexual reproduction between genetically dissimilar parents.
(Just why sexual reproduction is so popular throughout the world of living things is still a hotly-debated question, but the fact remains.) ...
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Some species support or force allogamy by complex mechanisms, such as genetic self-incompatibility, heterostyly, dichogamy or herkogamy.
Also called xenogamy, outbreeding, and sometimes cross breeding.
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Or isolation may be social, induced by the lack of appropriate partners, such as Protestant princesses for Protestant royal heirs. Since the late middle ages, it is the urban middle class that has had the widest opportunity for outbreeding.
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