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[QUOTE]Originally posted by Doug M: [QB] [QUOTE]Originally posted by BrandonP: [qb] With regards to the hair texture discussion, I am still inclined to think that fluffy "Afro" hair, while probably not ancestral for hominins, may be ancestral for [i]Homo sapiens[/i] at latest and that straighter hair in certain modern human populations represents a series of reversions. Consider that a lot of the African populations with fluffy hair are otherwise very distinct genetically from one another, often more than some of them are distinct from non-Africans. [IMG]https://i0.wp.com/cdn-images-1.medium.com/max/800/1*JNQShSYIXT08JnV-sOrRVw.png?w=525&ssl=1[/IMG] If kinky hair was something that developed in sub-Saharan Africa after OOA, you'd think there would be far more genetic uniformity among extant Africans than we observe due to them all descending from the same selective sweep. Instead, we have a bunch of genetically disparate African populations, and even some non-Africans, sharing the trait of fluffy hair. If we apply [URL=https://en.wikipedia.org/wiki/Phylogenetic_bracketing]phylogenetic bracketing[/URL] here, fluffy hair seems more likely to be ancestral for AMH. That doesn't necessarily mean the looser or wavier textures you see in some ancient Egyptian and Sudanese mummies is entirely due to admixture with West Eurasian back-migrants. I suspect what happened in North Africa could be analogous to what apparently happened within Australasian populations. Papuans, Melanesians, and the extinct indigenous Tasmanians all have or had fluffy hair, yet indigenous populations on the Australian mainland have predominantly loosely curled, wavy, or even straight hair. Maybe prehistoric North Africans underwent selection for less fluffy hair as a result of living in a desert climate analogous to that of the Australian interior? I wouldn't even rule out the possibility that this development even contributed to the predominant hair texture in western Eurasia today if we consider Basal Eurasian admixture in current West Eurasians. [/qb][/QUOTE]I think that across all African populations over time various genetic traits existed as part of random mutation or other factors and then were amplified based on natural selection. And over time different population bottlenecks limited the amount of these variant traits in the resulting population in various waves of OOA. And one of those waves likely had a higher occurrence of straighter hair. Keep in mind that there still are a lot of questions about the exact nature of the split between HSS and other archaic hominids in Africa. So there is a lot we don't know. I doubt that OOA was a single event. I also believe that a segment of these populations existed in North Africa which would best be described as proto Eurasian, but was likely absorbed or replaced in various areas due to waves of mixture with other Africans and later Eurasians. [/QB][/QUOTE]
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