Biology / Bio 1763 · Atom · ~20 seconds
Gene Flow and Clines
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Gene flow is the movement of alleles between populations through migrants or gametes; a cline is gradual variation across an ecological gradient.
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Pollen carried by wind between plant populations is gene flow; a species growing larger toward the poles shows a latitudinal cline.
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Ongoing gene flow keeps a cline's variation gradual; restricted flow sharpens differences along it and can eventually drive speciation.
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