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Euro male signature in North Africa
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[QUOTE]Originally posted by Troll Patrol: [QB] [QUOTE]Originally posted by xyyman: [qb] Everyone is an African...if we go back far enough. Remember Africans had a 150,000yr head start. They perfected this thing. They have seen it all. [/qb][/QUOTE]Dr Spencer Wells, Harvard evolutionary geneticist:[b] There is more genetic diversity in any single African village than in the whole world outside Africa.[/b] [IMG]http://tinyurl.com/orwextz[/IMG] Geneticist Sarah Tishkoff: [b]Non-Africans are recently descendant from a small population of East Africans.[/b] [QUOTE] [b]Africa is the birthplace of modern humans[/b], and is the source of the geographic expansion of ancestral populations into other regions of the world. Indigenous Africans are characterized by high levels of genetic diversity within and between populations. [i]The pattern of genetic variation in these populations has been shaped by demographic events occurring over the last 200,000 years. [/i] [b]The dramatic variation in climate, diet, and exposure to infectious disease across the continent has also resulted in novel genetic and phenotypic adaptations in extant Africans. [/b] This review summarizes some recent advances in our understanding of the demographic history and selective pressures that have influenced levels and patterns of diversity in African populations. [i]Africa not only has the highest levels of human genetic variation in the world but also contains a considerable amount of linguistic, environmental and cultural diversity. For example, more than 2,000 distinct ethno-linguistic groups, representing nearly a third of the world’s languages, currently exist in Africa [/i] [b]The timing and duration of some of these demographic events were often correlated with known major environmental changes and/or cultural developments in Africa [6]. A number of novel genetic and phenotypic adaptations have also evolved in Africans in response to dramatic variation in environment, diet, and exposure to infectious disease across the continent. [i]In some cases, these adaptations have occurred in the last several thousand years, exemplifying the ongoing evolution of human populations. [/i] Thus, present-day patterns of variation in African genomes are a product of both demographic and selective events.[/b] [/QUOTE]--Sarah Tishkoff et al. (2010) The Evolution of [b]Human Genetic and Phenotypic Variation in Africa[/b] [/QB][/QUOTE]
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