gene flow

noun Ecology.
the alteration of the frequencies of alleles of particular genes in a population, resulting from interbreeding with organisms from another population having different frequencies.

1945–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gene flow
the movement and exchange of genes between interbreeding populations

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Political boundaries are irrelevant except where topography has limited gene
  flow between populations.
Because humans are wide ranging and can live in a variety of habitats, he says,
  it's likely gene flow was sustained.
The two subspecies used to intermingle, so transferring a few females would
  restore some of the natural gene flow.
Yet there is evidence of high gene flow among vents.
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