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L3 basic lineages migrated back to Africa, new human origin model, Cabrera 2018
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[QUOTE]Originally posted by Jm8: [QB] Another significant issue with Cabrera’s theory: He argues that the lack of relative lack of mtdna M in the levant (and its greater abundance in deeper rootedness further toward South East Asia an Oceania (rather than nearer to Africa), as well as the south East Asian base of N, is evidence that they (M and N) did not originate near Africa, and therefore that its ancestor L3 did not originate in Africa but somewhere closer to Asia. However, the lack of basal M in current populations near Africa (such as the Levant), seems more likely due to later migrations within Western Eurasia, which could easily obscure the original earlier paleolithic distribution of lineages. As commenter Lank explained: https://anthrogenica.com/showthread.php?13043-Carriers-of-mitochondrial-DNA-macrohaplogroup-L3-basic-lineages-migrated-back-to-Afri “The correlation between Y-DNA DE and mtDNA L3 in Africa has been obvious for many years. There is no a priori reason to assume Y-DNA DE originates outside Africa, especially when it has roughly the same age as mtDNA L3 (although, if it was part of a back migration, it certainly would have brought some mtDNA L3). There was mtDNA M and even pre-N, as well as a lot of Y-DNA C even in Paleolithic Europe, so the modern concentration of Y-DNA/mtDNA diversity in eastern rather than western parts of Eurasia is not representative of the distribution going back tens of thousands of years.” Also, the makeup of Western Eurasia (and some degree India) greatly changed during prehistory due to the back-migrations of more northerly Eurasians, in waves between the late paleo-lithic/mesolithic and neolithic—(who were likely of "proto-caucasoid" type) into South West Asia (including the Levant and Near East)—whose ancestry is now dominant in those areas, largely replacing the earlier inhabitants (directly descended from the first 70 ka bc OOA settlers of those regions (who would have been closer to a proto-Oceanic or so called proto-Austaloid type). The descendants of the earlier modern human inhabitants of South Eurasia survive only in mixed form in India (the ASI/ancestral South Indian component, which is always to some degree hybridized with the more N. W. Eurasian/early "caucasoid"-related ANI component), and sometimes in less mixed form in Oceania and a few parts of South East Eurasia (as Negritos, Andamanese, Melanesians, Papuans, Australians, etc), some of which populations may preserve some more basal Eurasian lineages lost closer to Western Eurasia due to later migration and population replacement. Also, perhaps somewhat importantly, M is also found in the horn of Africa—Somalia and Ethiopia, and at low levels in the Maghreb. And in those places is considered to come from a paleolithic migration from S.W. Eurasia into N. E. Africa and the horn (which indicates that early M once existed in early South West Eurasia; in Arabia and/or the Levant, before later population movements) A somewhat similar back-migration of more northern Eurasians occurred in the South East of Eurasia involving the swamping of the S.E. Asian Negritos in many areas by what would termed proto-mongoloids/early Eastern Eurasians (who/a cluster or cline that likely originated from South China, North Thailand, or some where between that region and the south Himalayas such as N. E. Myanmar/Burma) in the neolithic period. It seems more likely that the originally East African L3 left Africa, split into M (in South West Asia, perhaps near Arabia or the Near East), and into N perhaps closer to South Asia/India or East India bordering S. E Asia. And that much M/more basal M in West Eurasia, the Middle East, and parts of West India (and N in West Asia and the Indian subcontinent), was replaced (with more derived/less basal lineages—less basal than those that had survived in places like Australasia) by later more northern-derived populations. [/QB][/QUOTE]
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