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Politics : Formerly About Advanced Micro Devices
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To: tejek who wrote (247316)8/24/2005 5:30:30 PM
From: combjelly  Read Replies (1) of 1584048
 
"Why the color variations? Did color simply accompany a trait that was needed for the survival of a particular group?"

Melanin is both biologically expensive, pigments tend to be, and interfere with the production of vitamin A. No race would develop much of it unless it needed to. Case in point, the Inuit. They came over relatively recently from Asia. So they would have Mongolian ancestry. But, they have many cold adapted changes, the stocky build, relatively flat nose, etc. Why are they darker than northern Europeans? One big reason is that they spend a fair fraction of the year outside in ice and snow, an excellent reflector. Native Americans came earlier, displacing the groups that had preceded them with little or no mixing. They are darker than northern Europeans because they are considerably further south. Just look on the globe, the equivalent latitudes in Europe that they ranged over is deep in the Sahara up to the middle of France or so.
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