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Data from a 40,000-year-old man in China reveals complicated genetic history of Asia
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[QUOTE]Originally posted by Clyde Winters: [QB] The sample used in the study were the archaic humanoids: Altai Neanderthals, and the Denisova; the western Eurasian clade was represented by Mal’ta 1 and , Ust’-Ishim individuals; indigenous populations from , New Guinea, Australia, Onge ( from the Andaman Islands), and the Ami (aboriginal Taiwanese) represented the eastern clade. The basic error in this method is that the authors are comparing ancient and modern DNA, with the full knowledge that the ancient DNA, rarely corresponds to contemporary populations. In addition the authors use the date of the Ust’-Ishim individual as the terminal date for the separation of the eastern and western clades. Granted, the authors acknowledge that the Ust’-Ishim individual shows no admixture in Australasians . But this is not surprising , there are no living descendants of Ust’-Ishim. As a result, s/ he can not represent the point when the eastern and western clades separated . Interestingly, the Tianyuan DNA, belongs to the mtDNA R macrohaplogroup, namely haplogroup B, in addition a deletion of a 9-bp motif (5′-CCCCCTCTA-3′, revised Cambridge reference sequence positions 8,281–8,289). This haplogroup is not carried by the indigenous populations from , New Guinea, Australia, Onge ( from the Andaman Islands), and the Ami (aboriginal Taiwanese) that represented the eastern clade in this study. The failure to adequately discuss the Tianyuan DNA, makes the conclusion of the paper suspect, since the authors are claiming that the Australasians, represent the eastern clade, eventhough the Tianyuan individual is 45ky old. Moreover, the presence of the 9-bp motif clearly indicates an African influence among the Tianyuan. The argument implying that Tianyuan man relates to Native Americans is pure bs. It is bs because Asians could not cross the Bearing Straits until 25,000 years after this man had died. Given the separation in time between the Native Americans and Tianyuan man make this proposition ludicrous. Reference: Qiaomei Fu et al. DNA analysis of an early modern human from Tianyuan Cave, China. PNAS, published online before print January 22, 2013. http://www.pnas.org/content/110/6/2223.full [/QB][/QUOTE]
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