arch 080325 - at a regular rate Regional Continuity...

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Neanderthals Modern Homo Sapiens Sapiens: Two evolutionary models on how modern humans evolved: where did our diversity come from? Two models of Neanderthals’ evolution/what happened to them: The Replacement Model: Also called the out of Africa model Modern humans replaced Homo Erectus and Neanderthals coming out of Africa. Has modern Homo Sapiens evolving in Africa between 200,000 and 100,000 ya Total Replacement – Noah’s ark, or eve model Christopher Stringer, Rebecca Cann, argues for a common mother for us all that lived in Africa 200,000 years ago. 147 placentas, mitochondrial DNA accumulates mutations relatively faster than nuclear DNA Differences in mitochondrial DNA would be greater in the longer established groups Klasies River Mouth, Broken Hill, Qafzeh, Skuhl. Problems: using African American blood to get current DNA, the assumption that the mutation changes
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Unformatted text preview: at a regular rate. Regional Continuity Regional Continuity , multiregional evolution, or candelabra model traces all modern human origins back to Africa when a generic homo left Africa Genetic Drift of Gene Flow – migration and intermarriage led to evolved modern forms but retaining some relatively minor regional traits which would be described as racial characteristics, based on changes in skull morphology , especially Asia and Australia Wolpoff , and Thorne Which model is right? Multiregional places “out of Africa” at 1.8 mya with Homo Erectus. Changes in skull morphology Replacement places “out of Africa at 200,000 – 100,000 ya with modern Homo Sapiens. Mitochondrial DNA...
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