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Phenomenon mediated by postzygotic barriers.
The costs associated with postzygotic barriers to reproduction should select for avoidance of those costs, which is achieved via the evolution of prezygotic barriers. Indeed, this is especially selection for those prezygotic barriers other than geographical and habitat isolation. This is selection instead for traits that exist specifically for the sake of avoiding the fitness losses to parents associated with hybridization and resulting progeny.
The process of speciation in many cases stems particularly from selection for reproductive isolation, that is, the separation of gene pools via natural selection because the costs associated with hybridization to individuals simply is too high to sustain.
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