Moth



Blackwell Publishing

Allopatric speciation

A single randomly mating species is widely distributed through a geographical region.

Quite suddenly, a natural barrier forms, dividing the species into two separate groups.

Over the succeeding generations, either through selection or random events, the two populations come to differ.

When the barrier is removed, the populations are now so different that there is no reproduction between them: they have become two distinct species.

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