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[QUOTE]Originally posted by Doug M: [QB] Continuing the thought. They have found 45,000 year old remains in Siberia and sequenced the DNA. They have found 35,000 year old remains in Romania and sequenced the DNA. But the "oldest" DNA they have sequenced in Africa is 8,000 years old and to hear them tell it, is the result of wandering Eurasians as if African DNA stems from Eurasians and not Africa. As if Africa is the child and Europe the parent. And people think this is logical. [QUOTE] The Way, Way Back Gene Machine There is more genetic diversity among humans in Africa than in any other population, but until now, attempts to understand the different threads woven into that fabric have been limited almost entirely to studying modern African DNA. [b]“We have almost no human fossils from about 30,000 to 300,000 years ago,” says Thompson, acknowledging that despite advances in aDNA extraction, the chances of finding the same amount of it in Africa compared with cooler climes are slim. “We’re not going to have a 300,000 year old Homo heidelbergensis with preserved DNA like they had in Spain. I get that. But if we only look at modern genomics, what are we missing?”[/b] [b]Some researchers look to modern hunter-gatherers, such as the Hadza of Tanzania, and view them almost as frozen in time, representative of ancient populations. But Thompson points out that, despite their traditional lifestyles, the Hadza and other groups have had considerable interaction with populations around them over time.[/b] Says Thompson: “To treat them as relics is tempting but not helpful. We’re able to step back to before them and see how people were actually interacting.” By sequencing aDNA from the 15 prehistoric individuals and integrating the results with other African DNA and aDNA studies, the team was able to determine that people ancestral to the indigenous people of southern Africa were once distributed much more broadly, but that several of these populations were replaced over time by farmers moving in from western Africa. The study also uncovered that herders who lived more than 3,000 years ago in what’s now Tanzania were partly ancestral to later individuals spread from Africa’s northeast to its southern edge. A surprise find included relationships between some of the ancient African DNA with that of ancient DNA from early farmers of the Levant, or eastern Mediterranean, who lived roughly 10,000 years ago — but don’t assume that means there was a long-distance love connection. While it’s possible individuals from the two populations met, it’s also possible that the shared genetic material was inherited from an even older population ancestral to both. The genetic makeup of the seven Malawi aDNA samples was particularly interesting: They indicate a long-standing population, distinctive to all others, that lasted for about 5,000 years but no longer exists. What happened to the ancient Malawi people remains a mystery for now, but it’s a question that archaeologists and paleogeneticists may one day answer through further collaboration. [/QUOTE] http://blogs.discovermagazine.com/deadthings/2017/09/21/oldest-african-dna-offers-rare-window-into-past/ But obviously you are missing a whole lot if you are modeling African DNA based on Eurasians that are only 50kya old whereas Africans have been around at least 3 to 4 times that long. How many times have Africans moved between East and West Africa over the last 250,000 years? How many times have Africans moved between Northern and Southern Africa over the same time period? Obviously there are many dead ends and branches that you won't find if you only look at modern DNA. Which means using modern DNA to model the past, especially modern DNA which is based on remains that are more recent than remains outside of Africa are going to produce misleading results. So what they do is they use these populations like the Yoruba and other so-called "sub Saharan" populations as "proxies" for what African DNA was present 50,000 years ago, which is highly problematic. Which is why it seems like all these Africans are Eurasians as opposed to Eurasians being downstream descendants of Africans as they should be. [/QB][/QUOTE]
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