Biology / Unit 8 Bio 1719 short lesson, about 20 seconds
Gametic Isolation
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The idea
Gametic isolation is a prezygotic barrier in which two species' egg and sperm cells are incompatible, so fertilization fails even after mating occurs.
In practice
Sperm from one species failing to bind or fuse with eggs from a related species is a gametic barrier acting after mating.
Where people slip
Gametic isolation can act even after successful mating — mating without fertilization still counts as prezygotic failure.
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