Biology / Bio 1717 · Atom · ~20 seconds
Mechanical Isolation
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Mechanical isolation is a prezygotic barrier in which two related species' reproductive structures do not physically fit together, preventing mating.
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Male damselflies of different species have differently shaped reproductive organs that do not fit another species' female structures.
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Mechanical isolation blocks mating through structural mismatch — distinct from gametic isolation, which blocks fertilization after mating occurs.