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Microevolution (view source)

Revision as of 00:47, February 12, 2007

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The theory that [[natural selection]] can, over time, transform an [[organism]] into a more specialized species of that organism.
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Microevolution, broadly defined, is the inevitable small-scale changes in [[allele]] frequencies in a population within the same species.  Under this broad definition, this change in overall allele frequencies occurs with every birth or death of a member of the species.
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Microevolution, narrowly defined, is the unproven theory that [[natural selection]] can, over time, transform an [[organism]] into a more specialized version within the same species.  Lack of evidence for [[natural selection]] has led most scientists to use the broad definition above rather than a definition based on [[natural selection]].
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