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New study supports out-of-Africa theory
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A NEW study of Y chromosome markers in over 12,000 men from 163 populations in East Asia strongly confirms the "out-of-Africa" hypothesis of modern human origins.
This theory states that a population of modern humans of African origin arose about 100,000 years ago and replaced all other populations of archaic humans across the globe.
Writing in the latest issue of Science weekly, a research team led by Chinese scientists from Fudan University in Shanghai, China says that it examined the chromosomes of individuals from Iran to New Guinea, looking for three specific Y chromosome mutations that are derived from a single earlier mutation in African populations.
Only males have a Y chromosome, which is passed from father to son.
Totally 12,127 men were sampled in the study and all of the men carried one of the three mutations. These data suggest that archaic populations in East Asia did not contribute to the origin of modern humans in the region, say the authors.(Xinhua)
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