"Until the agricultural revolution 10,000 years ago,people used to live in small populations with little gene flow between them.That is the best situation for rapid evolution," said Sewall Wright,one of the founders of population genetics.This conclusion on gene flow conflicts with the Hardy-Weinberg equilibrium,which states that no gene flow means

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The Hardy-Weinberg equilibrium states that in the absence of external factors (such as natural selection or genetic drift) and with random mating, the gene frequencies in a population will remain constant from generation to generation. Therefore, if there is no gene flow (i.e. no migration), the population is isolated and there will be no change in the gene frequencies, meaning no evolution. However, Sewall Wright is referring to situations before the Hardy-Weinberg equilibrium is established, when populations are small and isolated, and therefore more prone to rapid evolution.

"Until the Agricultural Revolution 10,000 Years Ago,people Used to Live