Out of Afica theory and color. Creation and evolution oh my!!!!, page 1
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reply posted on 11-12-2010 @ 08:07 AM by myster0
reply to post by LDragonFire



Humans are one of the strongest environmental pressures on Earth, especially against each other.
Both attractive beauty, and the horrific act of rape are selected for, for example.

Any slight variation in physical appearance, towards "Attractive", spreads quickly through a shallow gene-pool.

If you're interested in the genetic basis of hair colour, check out wikipedia:
Genetics and biochemistry of hair color
edit on 11-12-2010 by myster0 because: genetics
edit on 11-12-2010 by myster0 because: (no reason given)



reply posted on 11-12-2010 @ 06:24 PM by LDragonFire
reply to post by Kailassa



What Im wondering is did this change in color begin before we left Africa or did it start after we left. If it started after we left it seems to me this is a very fast change given the amount of time.


reply posted on 12-12-2010 @ 10:09 AM by madnessinmysoul
reply to post by LDragonFire



Well, it's something that could happen relatively fast. We've been able to do it with other species in several generations. I'll find a few sources when I can, but selecting for coloration is one of the easier things to do.


reply posted on 15-12-2010 @ 06:10 PM by Kailassa
Originally posted by LDragonFire
reply to
post by Kailassa



What Im wondering is did this change in color begin before we left Africa or did it start after we left. If it started after we left it seems to me this is a very fast change given the amount of time.


The Pharmacology of Vitamin D, Including Fortification Strategies

. . . the lack of vitamin D resulted in a natural selection for white skin colour as a way to prevent rickets and osteomalacia within defined environments. Women with osteomalacia would have produced few offspring, while those able to produce enough vitamin D to prevent rickets and osteomalacia would have been the vast majority in any region - survival depended on adequacy of vitamin D nutrition, and natural selection of skin color helped to ensure adequacy.


To explain, dark skin suited the African environment where there was lots of sun, so the melanin was needed to protect from skin cancer and there was still enough sunlight "absorbed" to make adequate vitamin D.

When some humans moved to areas where the sunlight was less intense, they could not stay healthy with such dark skin because they could not absorb enough sunlight. The lighter skinned ones were more able to reproduce, thus the colour of the population quickly changed.

If a few thousand pale-skinned people moved to Africa and spent their days outdoors, almost naked, the least pale skinned ones would be the ones most able to pass on their genes. The palest would be the most likely to suffer severe sunburn and skin cancer. Give them 1000 generations living like that, which in that environment would be 15,000 to 20,000 years, and their descendants would most likely be black skinned.
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