Blue eyes caused by genetic mutation?!

Discussion in 'Et Cetera, Et Cetera' started by IntoxicatingToxin, Jan 31, 2008.

  1. IntoxicatingToxin

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  2. Pecker

    Pecker Retired Moderator
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    No, really, a brown-eyed ancestor decided he'd like to have blue eyes and voila they evolved.
     
  3. Mandee

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    I have blue eyes :)
     
  4. IntoxicatingToxin

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    Freak of nature. :rolleyes:

    Just kidding!!!! :tongue:
     
  5. midlifebear

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    Hmmmm . . . you know, this is going to cause all poop to hit the fan with those anti science school boards in Florida. We'd better duck (unless you're into that sort of thing).
     
  6. B_Marius567

    B_Marius567 New Member

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    I have Blue eyes :)
     
  7. dima007

    dima007 New Member

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    I have blue eyes with green in them too...freaks of nature UNITE!
     
  8. D_Fiona_Farvel

    D_Fiona_Farvel Account Disabled

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    A good portion of my family have blue eyes, and that is rare for Black people, so I believe a mutation could explain it. Our eyes are either bronze to medium brown, or blue. Weird.
     
  9. Principessa

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    Does the last sentence mean that blue-eyed people are hornier? :confused:

    If one blue-eyed person has sex with another blue-eyed person they are actually having sex with . . . a relative, :eek: which is incest! Eeeww! :yikes: That's disgusting!!


    Here's what made those brown eyes blue
    Scientists find that blue-eyed individuals have a single, common ancestor
    By Jeanna Bryner
    LiveScience
    updated 2:01 p.m. ET, Thurs., Jan. 31, 2008


    People with blue eyes have a single, common ancestor, according to new research.

    A team of scientists has tracked down a genetic mutation that leads to blue eyes. The mutation occurred between 6,000 and 10,000 years ago, so before then, there were no blue eyes.
    "Originally, we all had brown eyes," said Hans Eiberg from the Department of Cellular and Molecular Medicine at the University of Copenhagen.

    The mutation affected the so-called OCA2 gene, which is involved in the production of melanin, the pigment that gives color to our hair, eyes and skin.

    "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," Eiberg said.

    The genetic switch is located in the gene adjacent to OCA2 and rather than completely turning off the gene, the switch limits its action, which reduces the production of melanin in the iris. In effect, the turned-down switch diluted brown eyes to blue.

    If the OCA2 gene had been completely shut down, our hair, eyes and skin would be melanin-less, a condition known as albinism.

    "It's exactly what I sort of expected to see from what we know about selection around this area," said John Hawks of the University of Wisconsin-Madison, referring to the study results regarding the OCA2 gene. Hawks was not involved in the current study.

    Baby blues
    Eiberg and his team examined DNA from mitochondria, the cells' energy-making structures, of blue-eyed individuals in countries including Jordan, Denmark and Turkey. This genetic material comes from females, so it can trace maternal lineages.


    They specifically looked at sequences of DNA on the OCA2 gene and the genetic mutation associated with turning down melanin production.

    Over the course of several generations, segments of ancestral DNA get shuffled so that individuals have varying sequences. Some of these segments, however, that haven't been reshuffled are called haplotypes. If a group of individuals shares long haplotypes, that means the sequence arose relatively recently in our human ancestors. The DNA sequence didn't have enough time to get mixed up.

    "What they were able to show is that the people who have blue eyes in Denmark, as far as Jordan, these people all have this same haplotype, they all have exactly the same gene changes that are all linked to this one mutation that makes eyes blue," Hawks said in a telephone interview.

    Melanin switch
    The mutation is what regulates the OCA2 switch for melanin production. And depending on the amount of melanin in the iris, a person can end up with eye color ranging from brown to green. Brown-eyed individuals have considerable individual variation in the area of their DNA that controls melanin production. But they found that blue-eyed individuals only have a small degree of variation in the amount of melanin in their eyes.


    "Out of 800 persons we have only found one person which didn't fit — but his eye color was blue with a single brown spot," Eiberg told LiveScience, referring to the finding that blue-eyed individuals all had the same sequence of DNA linked with melanin production.


    "From this we can conclude that all blue-eyed individuals are linked to the same ancestor," Eiberg said. "They have all inherited the same switch at exactly the same spot in their DNA." Eiberg and his colleagues detailed their study in the Jan. 3 online edition of the journal Human Genetics.

    That genetic switch somehow spread throughout Europe and now other parts of the world.

    "The question really is, 'Why did we go from having nobody on Earth with blue eyes 10,000 years ago to having 20 or 40 percent of Europeans having blue eyes now?" Hawks said. "This gene does something good for people. It makes them have more kids."


    © 2008 LiveScience.com. All rights reserved.
     
  10. B_Think_Kink

    B_Think_Kink New Member

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    All this stuff I learned in grade 9.
     
  11. jakeatolla

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    And you can still remember ???? :wink:
     
  12. D_Kay_Sarah_Sarah

    D_Kay_Sarah_Sarah Account Disabled

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    Great! Now im a genetic reject
     
  13. Not_Punny

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    Well, if we're all linked to a common ancestor, does it make it incest if two blue-eyed people get together?!

    0 0 0 0 0

    oops, sorry NJQT -- you beat me to that comment!
     
  14. SpoiledPrincess

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    We're all descended extremely distantly from whoever the first humans were so we're all having sex with a relative really :rolleyes:

    I just saw what hotmilf said, but as I already posted this I'll leave it as it is.
     
  15. Ed69

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    I think people are thinking to much.Boys get to it!Fuck your girl till her eyes pop out.Who cares what color they are!!!!
     
  16. jason_els

    jason_els <img border="0" src="/images/badges/gold_member.gi

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    Not where I'm from. If the 6 train is your mode of transportation then I suspect your ancestors are from the Ramapos.

     
  17. whatireallywant

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    Well, I don't know that it's a "mutation" as such :biggrin1:, but the gene for blue eyes is a recessive gene.
     
  18. DC_DEEP

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    If it makes you feel better, sweetie, just remember Adam and Eve, not Adam and Steve!:biggrin1:
     
  19. jeff black

    jeff black <img border="0" src="/images/badges/gold_member.gi

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  20. Catchoftheday

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