So...who all on here is kin to me then?
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. more:
http://www.foxnews.com/story/0,2933,327070,00.html