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[QUOTE]Originally posted by homeylu: [QB] Originally posted by Supercar [b] For instance, the people living in the tropics and hot zones are likely to have thicker kinky hair or curly hair. This is so that the skin of the head will be effectively protected from the sun.[/b] What about the skin on the rest of your body “exposed to the sun Supercar”, I think like I said earlier (melanin protects from the sun) which is why blacks can stay in the sun longer. But you’re close, hair texture is an adaptation process, in that extremely curly hair, traps moisture, in that several sweat glands located in the head are the most active. And to keep people from becoming dehydrated in the extreme (dry heat ) not (humid tropical heat) some of the moisture needs to be “trapped” after sweating has cooled the body down. And also this trait as carried in the genes of the original inhabitants. You almost had me convinced with the nose shape, and moisture escaping ( I thought you were on to something), but when you went to the jaw shape eating habits, all I thought was “junk science”, sorry. Originally posted by Supercar [b] I asked you for your source, because you said "50%" variation! That is almost like talking about two different species [/b] I don’t know about two different species, but if you do some research on nucleotide variations, you will find that for Africans the diversity is 50%, while for other populations the diversity is around 28%. What this simply means is that some African populations are genetically closer to others (i.e. Europeans) than they are to each other. All the other populations belong to just 3 lineages (combined-not each), Africans (sub-saharan) on the other hand belong to 22 lineages (which is amazing). In simple terms there are 22! Founding fathers for the subsequent African tribes. ( I can’t remember the source of this either, but type Tishkooff and Williams 2002, African genetics into a search engine). Originally posted by S. Mohammad [b] What do you mean migrations are irrelevant? They are inasmuch most people think Africans were affected only by people migrating outside into Africa but have never focused on intra-African migration. Migration of Africans from one part of Africa to another would cause genetic variation within African populations. Thats a fact you cannot say is irrelevant[/b] Sa3d, that’s actually my whole point, before you didn’t add [b] focused on intra-African migration [/b] so I didn’t know what you were getting at. I was just trying to show how diverse Africans are within themselves (without outside influence), and that its actually “them” that influenced the “outsiders” genetically before all the mutations took form. The 3 lineages found in all other populations, I, IIIA, and IIIB are ALL present in Africa. So I wasn’t clear on that statement. [/QB][/QUOTE]
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