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Lec15_ModernHomoSapiens_SS10

Lec15_ModernHomoSapiens_SS10 - ANP 202 Biocultural...

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ANP 202 Biocultural Evolution Lecture 15 Modern humans
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Evolution of modern Homo sapiens – 2 models Out of Africa Multiregional Continuity
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Out of Africa model Replacement/Speciation model Modern H. sapiens arose only in sub-Saharan Africa 90K ya, a group of modern H.s. expanded into Asia, Australia and later Europe, replacing (no interbreeding) earlier forms of Homo (erectus in Asia & neandertal in Europe)
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Multiregional Continuity Model Following the dispersal of erectus (1.7mya), modern H. sapiens evolved concurrently in different regions of the world Small size of initial colonizing groups & adaptation to local environments established regional differences But gene flow across regions prevented rise of multiple species Resulted in one species without replacement
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So how did humans evolve? Both models were once considered equally viable Current understanding of DNA & fossil evidence suggests that the Out of Africa model may be more probable Intermediate hypotheses more aligned with the Out of Africa model are explored e.g. Assimilation model
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