The restriction of gene flow leads to speciation because populations tend to EVOLVE INDEPENDENTLY
Gene flow refers to the movement and/or transfer of genetic material from one population to another of the same species (e.g., by migration).
A decreased gene flow promotes the divergence of populations of the same species through natural selection and genetic drift.
Gene flow may be blocked by physical barriers (e.g., a river), thereby leading to speciation because populations cannot exchange genetic material.
In conclusion, the restriction of gene flow leads to speciation because populations tend to EVOLVE INDEPENDENTLY.
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