Breeding within a narrow range of individuals(noun)
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Use "interbreeding" in a sentence
"The concept of a species whose capital depends upon interbreeding is complex."
"Svante Paabo of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany had previously dismissed the idea of interbreeding when he analysed Neanderthal mitochondrial"
"The AKC is rigorously against any kind of interbreeding, and has adopted a system of “pure” breeds that guarantees extensive amounts of destructive inbreeding will continue."