Posted by:
Gullible's Travel's
(
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Date: July 31, 2011 11:20PM
There are certain groups of Native Americans (tribes that have been geographically isolated) that can/do suffer from genetic problems because of their lack of genetic variation (diabetes).
Also, Iceland is being intensely studies because there is evidence of genetic disorders that have been linked to lack of biodiversity. (Also, Iceland is quite a bit more ethnically divers than most people realize.)
http://en.wikipedia.org/wiki/IcelandAs far as the other examples you gave: They have all benefited from biodiversity as war/disease and intermixing with other populations has kept them (and those they have interbred with) relatively healthy. In the program 'Guns, Germs, and Steel' you can see how intercontinental migration has served biodiversity in humans, even in groups that have tried to stay 'pure', whereas groups that have been geographically isolated have, throughout history, been decimated by diseases that most of humanity had long ago, through biodiversity, become immune too.
My main point was why, given the lessons of history, any human group would CHOOSE biological uniformity (and think they are stronger for it) is baffling and ludicrous.
So, as far as those that are racist enough to espouse bio-exclusivity despite the overwhelming evidence that it hurts our species- my message to them is, go ahead and keep your stupid genes to yourself.
As far as all of our ancestors being of African descent:
http://www.scienceinafrica.co.za/2001/nov/ancestor.htmWhile I understand that you couldn't exactly label our oldest African relatives as 'human' (ie: homo sapiens), my premise still stands, which was: "If any human traces their ancestry back far enough they will find that their 'grandparents' (back far enough) were all black (of African descent)."
(my use of the term 'black' was not meant to describe any current black homo sapien, but to simply say that ALL of our ancient relatives were most likely dark skinned and that 'white' skin came later as a genetic mutation as humans/human ancestors moved to climates less exposed to solar radiation.)
http://en.wikipedia.org/wiki/Homo_erectus