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[QUOTE]Originally posted by Clyde Winters: [QB] [QUOTE]Originally posted by Doug M: [qb] Bottom line the game being played here is mislabeling African origins of many ancient DNA lineages as "Eurasian admixture".... And no Africas genetic diversity is not fully documented. So to have folks talking about "Afrocentric" distortion but not pointing out the obvious Eurasiacentric distortion is simply hypocritical.... Do a search for West African DNA history and you will get more articles about Eurasian backmigration than you will about West African DNA.... And this is why reports like this can come out and not be challenged: [QUOTE] Introduction [b]African genetic diversity is still incompletely understood, and vast regions in Africa remain genetically undocumented. Chad, for example, makes up ∼5% of Africa’s surface area, and its central location, connecting sub-Saharan Africa with North and East Africa, positions it to play an important role as a crossroad or barrier to human migrations. [/b] However, Chad has been little studied at a whole-genome level, and its position within African genetic diversity is not well known. With 200 ethnic groups and more than 120 indigenous languages and dialects, Chad has extensive ethnolinguistic diversity.1 It has been suggested that this diversity can be attributed to Lake Chad, which has attracted human populations to its fertile surroundings since prehistoric times, especially after the progressive desiccation of the Sahara starting ∼7,000 years ago (ya).2 ; 3 Important questions about Africa’s ethnic diversity are the relationships among the different groups and the relationships between cultural groups and existing genetic structures. In the present study, we analyzed four Chadian populations with different ethnicities, languages, and modes of subsistence. Our samples are likely to capture recent genetic signals of migration and mixing and also have the potential to show ancestral genomic relationships that are shared among Chadians and other populations. An additional major question relates to the prehistoric Eurasian migrations to Africa: what was the extent of these migrations, how have they affected African genetic diversity, and what present-day populations harbor genetic signals from the ancient migrating Eurasians? We have previously reported evidence of gene flow from the Near East to East Africa ∼3,000 ya, as well as subsequent selection in Ethiopians on non-African-derived alleles related to light skin pigmentation.4 A recent attempt to quantify the extent of such backflow into Africa more generally, by using ancient DNA (aDNA), suggested that the impact of the Eurasian migration was mostly limited to East Africa.5 However, previous studies using mitochondrial DNA and the Y chromosome in populations from the Chad Basin found some with an East African6 or Mediterranean and Eurasian influence,7 ; 8 and analysis based on genome-wide data9 found a non-African component (suggested to be from East Africa) in central Sahelian populations. Thus, studying diverse Chadian populations on a whole-genome level presents an opportunity to shed more light on the history of African-Eurasian mixtures, including whether or not selection after admixture is a widespread phenomenon in Africa and how the historical events in Chad are related to events that have occurred elsewhere in Africa and the Near East.[/QUOTE] http://www.sciencedirect.com/science/article/pii/S0002929716304487 Hence the Sub Saharan genetic ghetto where ancient DNA diversity is simply chalked up to "EUrasian backmigration" with no serious effort to go any further. [/qb][/QUOTE]LOL. This article is basing its conclusion on the presence of R1b1a. In the paper they call it L761. R1b1a is nothing more than V88. V88 is not isolated in Chad, as a result the author of this article is lying. As I said in an earlier post. It is only a matter of time before they declare that V88 is a European haplogroup, eventhough this hg is found throughout Africa. [/QB][/QUOTE]
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