Dictionary of Human Evolution and Biology

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Out Of Africa Again And Again Model

Model of early human origins, which holds that the original migration of Homo erectus out of Africa (see the out of Africa I model) about 1.7 mya was followed by a second expansion out of Africa between 840 and 420 kya, followed by a third expansion 150-80 kya (see the out of Africa II model), all followed by a much more recent introgression of genes from Asia back into Africa as proposed by the out of Asia II model. Developed by geneticist A. R. Templeton, the again and again model argues that there were at least two major radiations of humanity from Africa into Eurasia subsequent to the original out of Africa I model, and that the global replacement predicted by the mitochondrial Eve model is better explained by interbreeding (gene flow).

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