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Amazigh people and climate adaptation
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[QUOTE]Originally posted by MindoverMatter718: [QB] [QUOTE]Originally posted by osirion: [qb] [QUOTE]Originally posted by MindoverMatter718: [qb] [QUOTE]Originally posted by osirion: [qb] [QUOTE]Originally posted by MindoverMatter718: [qb] [QUOTE]Originally posted by osirion: [qb] Basically what you are saying was my original position. [/qb][/QUOTE]How? Elaborate please, because I don't think so. [QUOTE]Originally posted by osirion: [qb] However, it also means that the climate allowed for this gene to be expressed. If this allele was detrimental in the North African climate it certainly would not be represented in 62-100 percent of the population. [/qb][/QUOTE]Who said the allele was detrimental? The skin color the allele [i]causes[/i] is detrimental in this African environment, the allele doesn't discriminate and it gets passed on regardless, a European born in Africa is not going to automatically turn darkskinned because his/her skin color is not suited for the environment. So again, you're wrong, and what it means is that sexual selection and genetic drift helped spread this allele in geographically proximate populations in northern Africa, has nothing at all to do with climate allowing for it to spread sorry kiddo. If that were the case then the leucoderm phenotype associated with Europeans would have arose in situ Africa instead of being introduced genetically. If the climate would have allowed for this change instead of sexual selection and genetic drift we wouldn't see this; [URL=http://www.ncbi.nlm.nih.gov/pubmed/20031391]New data tells us more about cancer incidence in North Africa.[/URL] ^^This wouldn't occur if north Africa's climate was advantageous to this lighter skin. What makes sense, is sexual selection and/or genetic drift which ultimately spread this allele regardless of the detrimental results the allele caused in the environment of north Africa. [/qb][/QUOTE]If it was sufficiently detrimental it would be filtered out. [/qb][/QUOTE]How so? And says who, you? LOL. [QUOTE]Originally posted by osirion: [qb] Period. Don't need a bunch of double talk for that. [/qb][/QUOTE]So stop doing it. [QUOTE]Originally posted by osirion: [qb] However, I have yet to see enough evidence for genetic admixture to explain the pale skin of Atlas Berbers. [/qb][/QUOTE]Jeeeeeez, you can't be serious, are you really that much of a dullard? So you're telling me the derived SLC24A5 111*A allele associated with lighterskin ranging from 62-100% in some of these geographically proximate populations in northern Africa is not sufficient enough to explain their lighterskin? :confused: Did you ever graduate, from anywhere? LOL [/qb][/QUOTE]The question is, how can it have such a high frequency in people that are 50% African. Is that not evidence of recessive genes? [/qb][/QUOTE]First of all 50% African? Provide genetic data. Secondly as explained to you in several posts, genetic drift and sexual selection can help spread this allele throughout a population without any further admixture from the original source, which would be Europeans passing the derived SLC24A5 111*A allele associated with lighterskin, as we can also see in the middle east and Pakistan, which doesn't mean that the latter are more European either. This allele is carried by both males and females, its not a uni-parental marker. Hence in northern coastal Africa, you have admixture as noted from uni-parentals on both sides maternally and paternally, just not so much paternally. [QUOTE]Originally posted by osirion: [qb] That is my problem. The gene must have been rather advantagous to have reached that high of a concentration. [/qb][/QUOTE]The problem seems to only be in your comprehensiveness or lack thereof in pertinence to this subject. What this simply means is that the allele associated with lighterskin was passed on through admixture, this admixture is easily noted through analysis of their uni-parental markers, and genetic drift and sexual selection is what spread this allele to its high frequencies in northern Africa, the middle east and Pakistan as well. So far You have failed to demonstrate how the north African environment would be advantageous to pale skin. Like I already told you, if a European family moves to Africa and has kids in Africa, after a few generations and the kids still keep coming out white doesn't mean that the allele for pale skin is advantageous, it simply means genes are passed on from their predecessors regardless of where they're born. These northern Africans carry a derived allele for lighterskin through admixture from Europeans plain and simple. There's nothing advantageous about pale skin in Africa, sorry Osirion. [QUOTE]Originally posted by osirion: [qb] So regardles of these peoples lineage they are predominantly non-African in terms of gene expression.[/qb][/QUOTE]Huh? You make no sense. How would a derived allele associated with skin color spread by genetic drift and/or sexual selection account for their "gene expression"? Who taught you this? Or are you just making things up again as you go along? [QUOTE]Originally posted by osirion: [qb] Just explain this: how can you be predominantly one thing but have genes that are predominantly another? [/qb][/QUOTE]Earth to Osirion, they're not predominately one thing, and an allele is not "genes", as already explained to you genetic drift and/or sexual selection can help spread this allele without any further admixture from the source population. Jeez you're slow at catching on. [/QB][/QUOTE]
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