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Reference.org
Genetic admixture
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<p>Genetic admixture occurs when previously <a href="/facts/Reproductive_isolation/cVB4s7by">isolated</a> populations interbreed resulting in a population that is descended from multiple sources. It can occur between species, such as with <a href="/facts/Hybrid_(biology)/pzVJ54xU">hybrids</a>, or within species, such as when geographically distant individuals migrate to new regions. It results in <a href="/facts/Gene_pool/kYRN6qIa">gene pool</a> that is a mix of the source populations. </p>