Allopatric speciation occurs when

genetically related populations inhabit widely separated geographical area

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genetically unrelated populations inhabit widely separated geographical area

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genetically related populations inhabit the same geographical area

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genetically unrelated populations inhabit the same geographical area

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Solution

The correct option is A genetically related populations inhabit widely separated geographical area
Allopatric speciation is speciation that happens when two genetically related populations become isolated from each other due to geographical isolation.
When genetically related species live in the same geographic location, but they evolve differently and can no longer interbreed with each other. Then these species are considered as different species. This is known as sympatric speciation

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