What is the role of isolation in the evolution of populations?

Isolation is a factor in evolution. Isolation impedes the free crossing of individuals from neighboring populations; this ensures the accumulation of genetic differences between populations. Isolated populations are also subject to selection, and isolation itself stops the flow of genes from population to population. Gradually, the difference increases between populations, that even with the destruction of barriers, the crossing of such populations is no longer possible, this can lead to the appearance of new species.

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