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Allopatric speciation: the great divide  Allopatric
speciation is just a fancy name for speciation by geographic
isolation, discussed earlier. In this mode of speciation, something
extrinsic to the
organisms prevents two
or more groups from mating with each other regularly, eventually
causing that lineage to speciate. Isolation might occur because of
great distance or a physical barrier, such as a desert or river,
as shown below.
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