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Is Kmtian wavy and straight hair the only trait not shared with Ancient Nubians?
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[QUOTE]Originally posted by Troll Patrol: [QB] [QUOTE]Originally posted by Faheemdunkers: [qb] Lol @ Troll Patrol. You do realise the Earth rotates right? [IMG]http://howdoestheearthmovesample.wikispaces.com/file/view/EarthRotate.gif/84280527/509x284/EarthRotate.gif[/IMG] Africa has the lowest UV index diversity because the entire continent is in a medial latitude position - it recieves the most intense sunlight given its position. UV Index: Africa: 7 - 11 Americas: 1 - 11 Eurasia: 1 - 11 Africa has the lowest UV diversity. Btw, your second map shows exactly this limited UV diversity, the African spectrum is only 7 - 11. 1 - 5 "low uv" don't appear anywhere in Africa, not even the extreme north or south... -- Native Africans [trait-wise] have the lowest diversity in skin colour and hair texture. While all the other continents basically have a place with low uv levels (1 - 5), Africa doesn't. Africa is limited to high UV. Straight-wavy hair and light skin are adaptations to low UV only, they are non-African adaptations. [/qb][/QUOTE]Do you realize Africa has different climatic zones, including the Mediterranean climate. And on other hand we have Igbos and Khoisan (to name a few). Again you are debunking yourself with your UV-Index map. Shift your crooked eyes to the right (Asia). LOL [IMG]http://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Medclim.png/450px-Medclim.png[/IMG] [IMG]http://4.bp.blogspot.com/_crPBWW0i46s/TIMk4UPN4oI/AAAAAAAABAA/ZzdPSWcyFSc/s1600/the-global-solar-uv-index_004.jpg[/IMG] http://www.weatheronline.co.uk/cgi-app/weathercharts?CONT=euro&LANG=en http://www.weatheronline.co.uk/cgi-app/weathercharts?CONT=afri&MAPS=uv&LANG=en&LOOP=0 Anyway, Adaptations to Climate-Mediated Selective Pressures in Humans Angela M. Hancock et al. Since human populations occupy a wide variety of environments with respect to climate, selective pressures are expected to vary greatly across geographic regions. Adaptations to spatially varying selective pressures are evident in the geographic distributions of many traits. For example, significant correlations exist between body mass and temperature [13]–[14], consistent with Bergmann's and Allen's Rules. Furthermore, there is evidence that human metabolism has been shaped by adaptations to cold stress from studies of arctic populations, which exhibit elevated basal metabolic rates compared to non-indigenous populations [15]. [b]Like body mass, variation in skin pigmentation is strongly correlated with climate and geography, i.e. distance from the equator and solar radiation [16]–[17]. Lighter pigmentation is likely to be adaptive in high latitudes, in part, because UV light is needed to penetrate the skin to produce vitamin D [16]–[19], which is necessary for calcium absorption and bone growth.[/b] [IMG]http://www.plosgenetics.org/article/fetchObject.action?uri=info%3Adoi%2F10.1371%2Fjournal.pgen.1001375.g001&representation=PNG_M[/IMG] (A) Maps show the distributions of summer and winter climate variables: maximum summer temperature, minimum winter temperature and solar radiation, precipitation rate and relative humidity in the summer and winter. (B) A heatmap shows the absolute values of Spearman rank correlation coefficients between pairs of climate variables. [IMG]http://www.plosgenetics.org/article/fetchObject.action?uri=info%3Adoi%2F10.1371%2Fjournal.pgen.1001375.t003&representation=PNG_M[/IMG] Table 3. SNPs with the strongest signals of selection among those associated with phenotypic traits in GWAS. [IMG]http://farm5.static.flickr.com/4091/4968578186_fcedf786cd.jpg[/IMG] [IMG]http://i23.photobucket.com/albums/b383/shurikenjay/NefertitiUnfinishedbust.jpg[/IMG] [/QB][/QUOTE]
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