Evolution is a divergence and a narrowing of genetic variance, hence primates are genetically more varied than homonids and blacks are more varied than whites or Asians.That doesn't get in the way of evolution.
Widening and deepening the gene pool, in any way whatsoever, provides more material basis for future evolutionary change in the event of a selection. Human beings are currently deficient or narrow, compared with other animals of similar size and distribution, in genetic variety.
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