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Module 1: Genética de poblaciones

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Reducción en el flujo de genes

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Biology - Reduction in gene flow

Reduction in gene flow

With reduction in gene flow between diverging populations, differences in
phenotype can become so significant over successive generations that even
if the populations were to mix, they would fail to interbreed to produce
vigorous, fertile offspring. Separate species would have formed, i.e.
populations would have become reproductively isolated. The gene pools of
the populations would be significantly different as gene flow would have
ceased.

Speciation can be summarised as resulting from the following:

* genetic variation in a population;

* environmental differences, acting as selective agents (for or against
certain characteristics);

* isolation of populations over time (successive generations) resulting
in no gene flow; and

* changes in allele frequency in the populations giving rise to distinct
phenotypes.

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