Parapatric Speciation
There is another possible way for new species to arise in the absence of geographical barriers.
Parapatric speciation. The differentiation into distinct species of populations experiencing some gene flow
Parasite. An organism living on or in, and negatively affecting, another organism ...
parapatric speciation Speciation that occurs in small, local populations, called demes.
paraphyletic groups Groups that do not include all descendants of a common ancestor.
In parapatric speciation, the zones of two diverging populations are separate but do overlap.
 See also: Habitat, Population, Speciation, Gene, Species
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