Allopatric
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<speciesfyi-glossary slug="allopatric"></speciesfyi-glossary>Definition
Describing populations or species that occupy separate, non-overlapping geographic areas.
Detailed Explanation
Allopatric distributions are the classic context for speciation — geographic isolation reduces gene flow and allows populations to diverge through selection and drift. The degree of overlap between sister species' ranges today provides evidence about how recently they diverged and whether reproductive isolation is complete. Completely allopatric sister species may still interbreed if brought into contact, indicating speciation is incomplete.