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Old 02-01-2008  
 
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Blue Eyes Caused By Genetic Mutation
King Of Kings King Of Kings is offline 02-01-2008 Rating:

Okay, here is an article that I've seen on several websites such as CNN, MSNBC, and FOXNEWS. I took FOXNEWS' article. It discusses how 6 to 10,000 years ago there was a genetic mutation somewhere along the line that caused a reduction of melanin in man which led to paler skin and lighter eyes. Much like albinism which is just an extreme reduction or the absence of melanin. Melanin is what causes pigmentation in the skin, hair, eyes and other areas of the body that need it. Melanin is in all genetic material and is what causes the color of all areas of your body. Even in your organs. What this article states is that all people at one time had color and brown eyes. Then there was a genetic mutation and caused blue eyes. All the other colors are how much of a reduction you have in your pigmentation. And all people who have a reduction in pigmentation have a common ancestor with that mutant person. So in essence the people with the reduction melanin or pigmentation are Caucasian and are a result of a genetic mutation of people with melanin or pigment and brown eyes.

My point is, I've been teaching this since I was 16 years old... I've always believed and it's just weird to me that scientist are now just catching on to what I've been saying for like 14 years... it's nothing against Caucasian people because I think genetic mutation and variation is special. It provides a diversity in species. It's just this is the answer I've always given whenever anyone would ask why there are different races. And if you can remember, I've even given this response on the board on countless occasions... you can read it here:

http://www.foxnews.com/story/0,2933,327070,00.html

If you've got blue eyes, shake the hand of the nearest person who shares your azure irises: He or she may be a distant cousin.

Danish researchers have concluded that all blue-eyed people share a common ancestor, presumably someone who lived 6,000 to 10,000 years ago.

"Originally, we all had brown eyes," Professor Hans Eiberg of the University of Copenhagen said in a press release. "But a genetic mutation affecting the OCA2 gene in our chromosomes resulted in the creation of a 'switch,' which literally 'turned off' the ability to produce brown eyes."

That "switch" — a simple change from "A," or adenine, to "G," or guanine, in the DNA — actually sits next to the OCA2 gene, which regulates the pigmentation of our eyes, hair and skin, and hence has only a limiting effect on it.

If the mutation had completely deactivated OCA2, all blue-eyed people would be albinos.

Eiberg and his team analyzed 155 individuals in a large Danish family, plus several blue-eyed people born in Turkey and Jordan.

All blue-eyed subjects had the mutation, and there was very little variation on the genes neighboring it on the chromosome, indicating that the mutation first arose relatively recently.

In contrast, most mammals share the "normal" form of the gene. The six-letter sequence is exactly the same among mice, horses, cows, rats, dogs, cats, monkeys, chimpanzees and humans with brown eyes. (No word on what gives Siberian huskies and Siamese cats blue eyes.)

Eiberg figures the mutation took place on the northern of the Black Sea, but that's an educated guess, assuming the first blue-eyed humans were among the proto-Indo-Europeans who subsequently spread agriculture into western Europe and later rode horses into Iran and India.

Ironically, neither the first person to have the mutation, nor his or her children, would have had blue eyes themselves.

Blue eyes are a recessive trait, and the gene must be inherited from both parents. (Green eyes involve a related but different gene, one that is recessive to brown but dominant to blue.)

It wasn't until the original mutant's grandchildren or great-grandchildren hooked up — cousin marriage is the norm through most of human history — that the first blue-eyed person appeared. He or she must have looked pretty odd for the Neolithic era.

Eiberg stresses that the genetic variation, as the press release puts it, is "neither a positive nor a negative mutation."

That's a bit disingenuous, as the mutation also produces greater instance of blond hair (sexually selected for even today) and fair skin, which confers a survival advantage by stimulating greater production of vitamin D in sun-starved northern European countries — exactly where blue eyes are still most prevalent.
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Old 02-01-2008   #21 (permalink)
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Re: Blue Eyes Caused By Genetic Mutation

OOPs
My bad...
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Old 02-01-2008   #22 (permalink)
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Re: Blue Eyes Caused By Genetic Mutation

soooooooooooooooooo what ur saying is, black ppl are better???

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