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Anthropometric and genetic plots on Saharans and Sahelians
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[QUOTE]Originally posted by Supercar: [QB] [QUOTE]Originally posted by rasol: [QUOTE]Originally posted by Supercar: I notice some correlations being made between 'autosomal' marker findings and Y chromosome markers. I can understand that this is being rationaled to the extent of invoking the last shared common ancestry between said groups; however what I cannot understand, is to assume that autosomal markers would be effective in clearly discerning this as does the Y chromosomes[/QUOTE]They don't. It's and oversimplication of course but try looking at autosomes as measuring distance, and sex chromosome as measuring origin.[/QUOTE]I know that autosomes can measure genetic distance; that is besides the point. The point is, how could autosomal analysis show that any two given populations with shared most recent history [naturally wherein inter-societal miscegenation is well documented] in geographical proximity to be any less genetically closer to one another than either two are to geographically distant groups with whom they “only” share a ‘distant’ common recent ancestry [as per Y chromosome and mtDNA markers] and have been considerably separated from the latter both in temporal and spatial sense? Wouldn’t you expect to see that populations which have more ‘recently’ crossbred in geographical proximity, despite possible different distribution patterns of TMRCA associations, to be relatively genetically closer when analyzed from the autosomal standpoint? [QUOTE]rasol: They are two interdependant, but nontheless distinct properties. [/QUOTE]Of course. [QUOTE]Originally posted by qoucela: [QUOTE]Originally posted by Supercar: [QUOTE]Originally posted by qoucela: No one knows what lineages were in Arabia in ancient times so we don't know what lineages originated in Arabia.[/QUOTE]Of course we do. How do you think TMRCA is attained? What do microsatellite diversity, sub-clade diversity and frequency distribution, and level of microsatellite differentiation mean to you?[/QUOTE]Well, I think they should mean very little if we can't acknowledge the fact that there have been population movements and migration in the past that may have led to wide difference in genetic and biological makeup between a couple thousand years ago and now. My whole point here is that biological populations within demographic areas move and change. [/QUOTE]Who said that populations don't move? [QUOTE]qoucela: Judging from your response, you must also have seen some DNA studies concluding that most modern populations in Arabia are directly evolved from ancient populations in Arabia. I would like to view them. [/QUOTE]Judging from your response, you must not have read past discussions on this board. Try Semino et al.'s 'origin, diffusion, and differentiation of Y chromosome haplogroups E and J, or Luis et al.'s Nile Valley-Levantine corridor Vs the African Horn study, amongst others. [/QB][/QUOTE]
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