[Prodigy54321]

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At some point inthe future either population A or poulation B will constitute 100% of the population. This is genetic drift due to randomness in the environment, as long as there is a differnece in reproductive success there will be change, it requires a mechanism to stop what would otherwise become a mathenmatical certainty given enough permeations.

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One mechanism that stops this completely hypothetical process from occurring in the real world is the increasing infertility among the members of the genetically drifting population that accompanies their individual divergence from the original stock.

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I'm pretty sure you are not right about how evolution occurs WRT reproduction...

I'm going to a class, but if no one else chimes in, I'll try to elaborate when I get back