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The Mechta-Afalou/Mechtoids redux thread
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[QUOTE]Originally posted by The Explorer: [QB] [QUOTE]Originally posted by The Explorer: [QUOTE]Originally posted by MindoverMatter718: Even during this time, these people still wouldn't have been pale as we see them today though, as the allele SLC24A5 111*A present in geographical proximate populations in the middle east, north Africa and Pakistan. Comes from gene flow with European populations. This allele was still under selection in the European population at this time, and only in Europe. So the question is when did Europeans come into these areas to contribute this admixture? [/QUOTE]Well, while it is certainly possible that some humans crossed the strait and into Africa, I doubt this would have been to any meaningful size, at least, at anytime prior to the arrival of Imazighen groups.[/QUOTE]Genetic evidence certainly raised the plausibility of migrations occurring the other way around; that is, Africans moving into Europe from North Africa: [i]"The prescence in Portugal of both the A and E1 haplogroups may be independent from the slave trade (otherwise E3a would be well represented since it comprises the majority of West African lineages). These findings either suggest a pre-neolithic migration from North Africa or a more recent origin from a founder population of small size that did not carry haplogroup E3a, which is a major component in North African populations today. TMRCA for Portuguese E1 lineages estimated as 22.9 +/- 7.2 ky favors the first scenario..." [/i] - Goncalves et al 2005. And... [i]“The medieval Priego sample showed greater affinities to North-Africa than other Iberian Peninsula samples including that of present day Priego. Haplotype analysis revealed that some African haplotypes detected in Medieval Priego have matches with samples of [b]precise north African origin as Tunisia, west-Sahara or the Canary Islands point to well documented historic connections with this area.[/b] However, medieval Priego [b]L1b lineages carrying the 16175 transition have their most related counterparts in Europe instead of Africa.[/b] The coalescence age for these L1b lineages is compatible with a minor prehistoric African influence on Priego that also reached other European areas.”[/i] - A. Gonzalez et al., 2006 [QUOTE] As for the skin tone development in Imazighen groups of northwest African coast, this is what I've said before; I believe much of it occurred during the historic era of the Holocene, and in no small part due to... "Trafficking of women from the other side of the Mediterranean sea as slaves surely must have left its own mark. This coupled with a tradition of polygamy [especially amongst those sections of north African populations which were Muslim-converts] would have facilitated households with sizeable headcount of offspring per a single male 'owner'. Then there were also sudden waves of migration to the north African coast during the fall of direct northwest African rule in the Iberian peninsula; no doubt families who reached the north African coast had left some genetic imprint therein. And of course, genetic drift has its own role to play in all this. All that aside, a look at samplings so far undertaken in coastal northwest Africa suggests that these have generally relied [i]on sampling small, scattered populations[/i] [see Cherni et al. 2005], giving fragmented or incomplete picture of northwest African maternal gene pool structure." The caveat here is that, if Imazighen populations had found some "white European" groups upon arriving in the northwest African coast, then it certainly doesn't appear to have been one of a large population, with a sizeable European male demography. Contemporary Imazighen speakers of the North African coast have very little to essentially neglegable European male contribution in their gene pool.[/QUOTE]And of course, inheritance of some of the pigmentation alleles associated with "light skin tones" may have come about by way of other demographic events, like historic Arab intrusions into north Africa [e.g. see: Arredi et al.] -- it is not a farfetched prospect either. After autochthonous male markers, haplogroup J is the next frequent marker in coastal North African groups. However, as one study noted, the frequency of this lineage in north Africa may well be largely attributable to positive genetic drift. [/QB][/QUOTE]
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