Blue eyes caused by genetic mutation?!

cristina69

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Yayyyyyyy =)
I Think In Toronto Its Only 2 Slices For 5$, Im Not Sure Though!

I Love How Pizza Pizza Totally Overtook A Discussion On Blue Eye Fakeness...BTW Brown Eyes Are The Hottest =)
 

Mem

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Here is a bad blue eye joke.

Did you know that the all the Space Shuttle Challenger crew members had blue eyes? One blew this way and one blew the other way.
 

naughty

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Yea miss mega...very interesting...seems the German medicine/sciensit has esp a strong background for during this research since Hitler days...

Also somthing interesting in my family's DNA is having green, hazel/light brown eyes in color...as some of our family members are getting older...their eye color is turning a mid-night blue /darkish green...with vision problems in some cases...very strange...it begains with a very small/thin ring around the iris then before long...the whole blue like color spreads:confused:
Many members of my family have hazel eye color including me... ( pretty I'm told... but I'm blind as a bat:biggrin1:).
It's recommend to wear tented len that adjust to the amounts of lighting outside and inside:wink:
So...here's looking at you my dear thru rose tented glasses:biggrin1:

PS= Remember that ole song Baby Aint Your Brown Eyes Blue!:rolleyes:

WHopper,

THe eye change you are refering to is called Cataracts. It happens quite often some families are more disposed to it than others. But people can change eye color it has been known to happen. SO potentially whatever you have in there can come out in the course of your lifetime.
 

liberia

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Don`t you know -- every single living thing on this planet is here because of genetic mutation. Two thirds of all Americans can`t seem to get their heads round this fact.
 

D_Sumefielde Sumesausage

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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.


That last sentence is incorrect because it can't be measured. It also sounds like blue eyed people only fuck and produce offspring with other blue eyed people. We know that's just not true. Two brown eyed parents can have blue eyed kids. Two blue eyed parents can have brown eyed kids too. Besides, it's not only europeans who have blue eyes. Russians, Iranians, Indians and Turkish people have among them people with blue eyes in varied %. Some asian people have grey eyes, who can explain that?
 

vergax

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That last sentence is incorrect because it can't be measured. It also sounds like blue eyed people only fuck and produce offspring with other blue eyed people. We know that's just not true. Two brown eyed parents can have blue eyed kids. Two blue eyed parents can have brown eyed kids too. Besides, it's not only europeans who have blue eyes. Russians, Iranians, Indians and Turkish people have among them people with blue eyes in varied %. Some asian people have grey eyes, who can explain that?

well, russians are europeans, even though there are literally hundreds of ethnias inside Russia, without counting the asian part of Russia which is more to do with, well, asian races.
Turkish, it is more difficult, because they are certainly mixed being a bridge between Europe and Asia. They also have a european side to the country (geographically), which I would consider european looking, also.
 

Jovial

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That last sentence is incorrect because it can't be measured. It also sounds like blue eyed people only fuck and produce offspring with other blue eyed people. We know that's just not true. Two brown eyed parents can have blue eyed kids. Two blue eyed parents can have brown eyed kids too. Besides, it's not only europeans who have blue eyes. Russians, Iranians, Indians and Turkish people have among them people with blue eyes in varied %. Some asian people have grey eyes, who can explain that?
I thought since the light eye color gene is recessive, that two light eyed parents will always have light eyed kids. Each parent has two genes for light eyes.
 

Viking_UK

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

Nope, just that us blue-eyed blondes get dirty quicker.

That last sentence is incorrect because it can't be measured. It also sounds like blue eyed people only fuck and produce offspring with other blue eyed people. We know that's just not true. Two brown eyed parents can have blue eyed kids. Two blue eyed parents can have brown eyed kids too. Besides, it's not only europeans who have blue eyes. Russians, Iranians, Indians and Turkish people have among them people with blue eyes in varied %. Some asian people have grey eyes, who can explain that?

Colour is almost always dominant over lack of it which is why two brown-eyed parents can produce blue-eyed kids. It's the same with hair and skin colour. If you have genes for a darker colour and a lighter colour, the darker colour is usually dominant. It's a little more complicated with hair and skin as there are more genes involved, but that's what it boils down to. It's very rare for light coloured parents to produce a darker coloured child.

Marco Polo wasn't the first European to reach Asia. Alexander the Great's army got to India centuries before and you can bet that a few kids were born as a result of that,a dn how many other individual travellers that we've never heard of made the trip? People don't always stay in one place, and all it takes to spread a gene around the world is for one person to go somewhere and have sex, so it stands to reason that there will be all kinds of mixtures of genes all over the world and they could all quite easily come from one common ancestor, as this paper states. 10,000 years is a hell of a long time really. Just look at the changes that have happened in North America in the last 500 years for example.
 

D_Relentless Original

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I have blue eyes, my Mom has Green eyes and ny Dad has Brown eyes.

My neices are both twins, one with blue eyes the other with Brown.

I work with a woman who has one brown eye and one blue eye.

Although i have blue eyes, my preference is dark brown eyes :tongue:
 

W/In 1 Stand Dev

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About the dalmations being deaf thing... I thought it was a white dog issue. As a dog comes closer to being all white, its chances of being deaf also go up.

I have blue eyes. I do still kinda have blonde hair. It was platinum when I was a kid.