Biology / Bio 1709 · Atom · ~20 seconds
Prezygotic Reproductive Isolation, Overview
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A prezygotic barrier prevents fertilization from occurring at all between two populations, blocking reproduction before any zygote can form.
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Two populations whose breeding seasons no longer overlap cannot fertilize each other, a prezygotic barrier operating before any mating attempt succeeds.
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A prezygotic barrier acts before fertilization — a postzygotic barrier, covered separately, instead acts after a zygote has already formed.