In biology, outbreeding depression occurs when offspring from crosses between individuals from different populations have lower fitness than progeny from crosses between individuals from the same population. The concept is opposed to inbreeding depression. This phenomenon can occur in two ways. First, intermediate genotypes may be disfavored. For ...
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http://en.wikipedia.org/wiki/Outbreeding_depression
The reduction in the degree to which local populations are adapted to their local environments as a result of individuals dispersing and mating with individuals in other populations (outbreeding). The reduction occurs because outbreeding individuals bring alleles adapted to one local environment into another, where they may be less advantageous.
Found on
https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
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