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Why the members of population do not bre...

Why the members of population do not breed with other populations.

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It is due to allopatric and sympatric speciation. A species is a collection of demes. The deme is a group of populations with common gene pool.
Allopatric speciation occurs when population of same species become geographically isolated.
Sympatric speciation occurs when a segment of origin population becomes isolated reproductively.
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