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Blue-eyed humans have a single, common ancestor
University of Copenhagen ^ | January 30, 2008 | Unknown

Posted on 01/30/2008 2:10:37 PM PST by decimon

New research shows that people with blue eyes have a single, common ancestor. A team at the University of Copenhagen have tracked down a genetic mutation which took place 6-10,000 years ago and is the cause of the eye colour of all blue-eyed humans alive on the planet today. What is the genetic mutation

“Originally, we all had brown eyes”, said Professor Eiberg from the Department of Cellular and Molecular Medicine. “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”. The OCA2 gene codes for the so-called P protein, which is involved in the production of melanin, the pigment that gives colour to our hair, eyes and skin. The “switch”, which is located in the gene adjacent to OCA2 does not, however, turn off the gene entirely, but rather limits its action to reducing the production of melanin in the iris – effectively “diluting” brown eyes to blue. The switch’s effect on OCA2 is very specific therefore. If the OCA2 gene had been completely destroyed or turned off, human beings would be without melanin in their hair, eyes or skin colour – a condition known as albinism. Limited genetic variation

Variation in the colour of the eyes from brown to green can all be explained by the amount of melanin in the iris, but blue-eyed individuals only have a small degree of variation in the amount of melanin in their eyes. “From this we can conclude that all blue-eyed individuals are linked to the same ancestor,” says Professor Eiberg. “They have all inherited the same switch at exactly the same spot in their DNA.” Brown-eyed individuals, by contrast, have considerable individual variation in the area of their DNA that controls melanin production.

Professor Eiberg and his team examined mitochondrial DNA and compared the eye colour of blue-eyed individuals in countries as diverse as Jordan, Denmark and Turkey. His findings are the latest in a decade of genetic research, which began in 1996, when Professor Eiberg first implicated the OCA2 gene as being responsible for eye colour. Nature shuffles our genes

The mutation of brown eyes to blue represents neither a positive nor a negative mutation. It is one of several mutations such as hair colour, baldness, freckles and beauty spots, which neither increases nor reduces a human’s chance of survival. As Professor Eiberg says, “it simply shows that nature is constantly shuffling the human genome, creating a genetic cocktail of human chromosomes and trying out different changes as it does so.”


TOPICS: Culture/Society; Miscellaneous; News/Current Events; Technical
KEYWORDS: blueeyes; eugenics; evolution; genetic; genetics; godsgravesglyphs; helixmakemineadouble; incest
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To: CholeraJoe
"Didn’t you used to have an animated map showing before and after?"

Yes, on This Thread:

Sundaland


101 posted on 01/30/2008 2:58:45 PM PST by blam (Secure the border and enforce the law)
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To: decimon

bump


102 posted on 01/30/2008 2:59:03 PM PST by ECM (Government is a make-work program for lawyers.)
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To: decimon

That is all well and good, but what about green and hazel eyes.


103 posted on 01/30/2008 2:59:57 PM PST by LukeL
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To: Constitutions Grandchild

One of the two must be fake.


104 posted on 01/30/2008 3:00:25 PM PST by rfp1234 (Phodopus campbelli: household ruler since July 2007.)
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To: rfp1234

LOL!!


105 posted on 01/30/2008 3:00:35 PM PST by TenthAmendmentChampion (Global warming is to Revelations as the theory of evolution is to Genesis.)
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To: FixedandDilated

Here’s some info about Cain’s wife:

http://www.answersingenesis.org/articles/nab/who-was-cains-wife

And about Noah, although I don’t know if your question is addressed:

http://www.answersingenesis.org/home/area/faq/noah.asp


106 posted on 01/30/2008 3:00:38 PM PST by Abigail Adams
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To: TheThirdRuffian

It is possible ... I know for a fact.


107 posted on 01/30/2008 3:01:46 PM PST by maggief
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To: TheThirdRuffian
It is impossible, barring mutation, for two blue-eyed parents to have a non-blue eyed baby. (You can sometimes get green, but I can’t remember how.)

Were you absent that day from class? Once upon a time, a daddy and a mommy loved each other very much...

108 posted on 01/30/2008 3:02:27 PM PST by TenthAmendmentChampion (Global warming is to Revelations as the theory of evolution is to Genesis.)
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To: blam

That’s it. We need one like that for the Atlantic showing Atlantis morphing into the Bahamas, Hispaniola, Azores and Canary Islands.


109 posted on 01/30/2008 3:02:38 PM PST by CholeraJoe ("A dead whale or a stove boat!")
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To: CholeraJoe
"That’s it. We need one like that for the Atlantic showing Atlantis morphing into the Bahamas, Hispaniola, Azores and Canary Islands."

Sundaland is probably Atlantis.

110 posted on 01/30/2008 3:04:54 PM PST by blam (Secure the border and enforce the law)
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To: CholeraJoe; SeaDragon

So my blue eyes are a gift from Atlantis. I like that. ;-)


111 posted on 01/30/2008 3:04:56 PM PST by RikaStrom (The number one rule of the Kama Sutra is that you both be on the same page.../Exeter 051705)
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To: LukeL
That is all well and good, but what about green and hazel eyes.

There's a mutant in the woodpile.

More seriously, I guess the green and hazel result from mixing the DNA of brown and blue eyed mates. Maybe someone with better knowledge will weigh in.

112 posted on 01/30/2008 3:07:04 PM PST by decimon
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To: Abigail Adams

Noah’s kids were all adopted, So it was sorta ok.


113 posted on 01/30/2008 3:11:05 PM PST by Dr. Bogus Pachysandra ("Don't touch that thing")
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To: decimon

Adam may have had brown eyes, but I believe Eve had green eyes.

/laughing


114 posted on 01/30/2008 3:12:02 PM PST by DeLaine (I see dumb people. They're everywhere. They don't even know they're dumb.)
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To: Abigail Adams

LOL! That’s cute!


115 posted on 01/30/2008 3:17:14 PM PST by FixedandDilated
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To: Dr. Bogus Pachysandra

Ah. I hadn’t considered that.


116 posted on 01/30/2008 3:19:43 PM PST by FixedandDilated
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To: fishtank
There were eight people on the ark, Noah, his wife, the three sons and their wives. I guess one of them was blue-eyed. At least the time line (6 to 10,000 years ago) is correct.

If that helps you sleep better at night, ok.

Of course the same sort of genetic tests that dated the last common ancestor of blue eyed people also dated the last common ancestor of human beings and chimpanzees as 4.1 million years ago.

What do you think about that?

117 posted on 01/30/2008 3:21:18 PM PST by Alter Kaker (Gravitation is a theory, not a fact. It should be approached with an open mind...)
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To: vortigern

118 posted on 01/30/2008 3:23:33 PM PST by traumer
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To: RockinRight
Wait...so if two blue eyed people get it on...it’s incest?

Dang, everyone in my family has blue eyes. Aunt, Uncle, cousins. Even my Bro-inlaw and nieces.

119 posted on 01/30/2008 3:30:23 PM PST by AFreeBird (No Romney, No Rudy, No McLame, No Huck, No Paul! Toss the GOP into the ashcan of History.)
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To: Sherman Logan; GQuagmire
Both your parents carried a recessive gene for blue eyes. They had a four in one chance of any child having blue eyes.

That's one possibility.

120 posted on 01/30/2008 3:33:20 PM PST by sphinx
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To: Alter Kaker

“One data point, does not an extrapolation make, grasshopper, or padawan, or whatever.”

All kidding aside,

there is a lot of hiding of the truth in too much research, I know this first hand. Also, there is far more scientific truth in the Bible than is commonly recognized.

Do you find it in the least curious that the blue-eyed divergence happened at the same time as the explosion of languages from a common root to form the Indo-European langage tree?


121 posted on 01/30/2008 3:33:33 PM PST by fishtank (Fenced BORDERS, English LANGUAGE, Patriotic CULTURE: A good plan.)
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To: AFreeBird
Dang, everyone in my family has blue eyes. Aunt, Uncle, cousins. Even my Bro-inlaw and nieces.

How many play the banjo? ;-)

122 posted on 01/30/2008 3:34:01 PM PST by decimon
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To: decimon
The “switch”, which is located in the gene adjacent to OCA2 does not, however, turn off the gene entirely, but rather limits its action to reducing the production of melanin in the iris – effectively “diluting” brown eyes to blue

Don't it make my brown eyes blue...

123 posted on 01/30/2008 3:34:06 PM PST by VRWCmember (Romney 2008 - The most palatable RINO left in the race)
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To: decimon

My mother had dark brown eyes
My father bright blue eyes
My brother and two sisters have dark brown eyes
I have hazel/blue eyes
My husband has bright blue eyes
Our children have bright blue eyes

Our dog has BROWN eyes... :)

What does this all mean???


124 posted on 01/30/2008 3:34:40 PM PST by cubreporter (I trust Rush. He has done more for this country than any of us will ever fully realize.)
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To: decimon
The “switch”, which is located in the gene adjacent to OCA2 does not, however, turn off the gene entirely, but rather limits its action to reducing the production of melanin in the iris – effectively “diluting” brown eyes to blue

Don't it make my brown eyes blue...

(Not a duplicate post, simply a better picture)

125 posted on 01/30/2008 3:35:19 PM PST by VRWCmember (Romney 2008 - The most palatable RINO left in the race)
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To: Sherman Logan
They had a four in one chance of any child having blue eyes.

That's some pretty good odds.

126 posted on 01/30/2008 3:36:28 PM PST by VRWCmember (Romney 2008 - The most palatable RINO left in the race)
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To: decimon
If I swallow anything evil
Put your finger down my throat
If I shiver, please give me a blanket
Keep me warm, let me wear your coat
127 posted on 01/30/2008 3:36:52 PM PST by steveo (Time flies like an arrow, fruit flies like a banana.)
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To: cubreporter
My mother had dark brown eyes

My father bright blue eyes

My brother and two sisters have dark brown eyes

I have hazel/blue eyes

My husband has bright blue eyes

Our children have bright blue eyes

Our dog has BROWN eyes... :)

What does this all mean???

Does the dog play the banjo?

128 posted on 01/30/2008 3:37:41 PM PST by decimon
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To: Drew68
I tell her that our future children are going to have brown eyes. That's not quite right, is it?

50-50 chance.

129 posted on 01/30/2008 3:37:47 PM PST by VRWCmember (Romney 2008 - The most palatable RINO left in the race)
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To: Revolting cat!

Introducing “Air-Brush Barbie”!


130 posted on 01/30/2008 3:37:47 PM PST by TexasNative2000 (Is this tagline governed by McCain-Feingold?)
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To: weegee

Thank you for the huge belly laugh!


131 posted on 01/30/2008 3:38:02 PM PST by EggsAckley
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To: Red_Devil 232

Mutant Ping back at ya. Mom and Pop have blue eyes - myself and all sibs have blue, all sibs married blue-eyed so all grandchildren are blue also. My son married a brown eyed gal but no kids - so the chain is probably going to be broken.


132 posted on 01/30/2008 3:39:09 PM PST by Paved Paradise
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To: decimon

My eyes are dark green with reddish brown centers, how did that happen? I am a cur?


133 posted on 01/30/2008 3:40:10 PM PST by Ditter
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To: devolve; ntnychik; PhilDragoo; dixiechick2000; decimon

So - my blue eyed son is linked to a different ancestor than me - his green eyed mom?? Lol


134 posted on 01/30/2008 3:40:42 PM PST by potlatch ("Kindness is more important than wisdom, the recognition of this is the beginning of wisdom" - Rubin)
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To: Ditter
My eyes are dark green with reddish brown centers, how did that happen? I am a cur?

Is your mom named Rosemary?

135 posted on 01/30/2008 3:41:41 PM PST by decimon
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To: fishtank
There were eight people on the ark, Noah, his wife, the three sons and their wives.

Really?

And what race were they?

136 posted on 01/30/2008 3:46:08 PM PST by humblegunner (If you're gonna die, die with your boots on.)
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To: GQuagmire
I have blue eyes. My parents have brown eyes

Your parents' secret childhood name for you was "Mailman's Surprise"...

137 posted on 01/30/2008 3:52:45 PM PST by ErnBatavia (...forward this to your 10 very best friends....)
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To: decimon

Blue eyes...Global warming caused it?


138 posted on 01/30/2008 3:54:28 PM PST by ryan71
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To: EBH
Okay, I'll throw in here:

My Dad had brown eyes, Mom had blue eyes...
both brothers were blond hair and blue eyes!!
me...redhead with green eyes....

My dad had blue eyes, mother had brown eyes...
3 boys, 1 girl....
2 boys had blue eyes and the girl had hazel (blue).
The other boy was brown-eyed...

You sure you're not the red-headed step child, Mr. Farkle?

139 posted on 01/30/2008 3:54:55 PM PST by Dubh_Ghlase (In the land of Clinton, where the shadows lie...)
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To: Sherman Logan

You mean 1 in 4 chance right.

B b
B BB Bb

b Bb bb

That’s 1 in four.... according to Gregor Mendel’s genetic trait grid thingy.


140 posted on 01/30/2008 3:54:56 PM PST by brwnsuga (Proud, Black, Conservative!!!)
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To: decimon

Hazel eyes like mine are about what you say, instead of having the code for blue eyes or green being homogenous across the iris you get a hodgepodge of green coded iris cells and brown coded iris cells equally interspersed across the whole iris in varying degrees, sometimes hazel eyes appear close to blue or green while others appear close to brown or amber. In many people with Hazel eyes you get different shades and different colors. My eyes for instance are green and blue with a gray backwash and one brown/black spot. There isnt any real genetic study to explain hazel eyes out there.


141 posted on 01/30/2008 4:02:47 PM PST by aft_lizard (born conservative...I chose to be a republican)
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To: aft_lizard

The girl who plays Lana Lang on “Smallville” is supposed to be half Chinese and half Dutch, yet her eyes are dark, sort of olive green. If I remember my old biology both of her parents would have to have some light eyed genes. I am not certain tho. Is it possible for a full blooded Chinese to have a green eyed child?


142 posted on 01/30/2008 4:13:15 PM PST by yarddog (`)
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To: VRWCmember

I always like the odds.

Sorry bout the typo. Sometimes I type faster than I think.


143 posted on 01/30/2008 4:18:00 PM PST by Sherman Logan
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To: Revolting cat!

Obviously a McCain voter!


144 posted on 01/30/2008 4:18:39 PM PST by Ezekiel
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To: aft_lizard

Yeah, I always put down brown for my eye color but there are actually several colors depending on the lighting.


145 posted on 01/30/2008 4:19:25 PM PST by decimon
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To: blam

bump


146 posted on 01/30/2008 4:19:57 PM PST by Centurion2000
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To: TheThirdRuffian
It is impossible, barring mutation, for two blue-eyed parents to have a non-blue eyed baby.

Ahem.

When paternity is contested in divorce court, the husband is proven to not be the biological father about 30% of the time.

Just saying.

147 posted on 01/30/2008 4:21:02 PM PST by Sherman Logan
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To: blam
This should help you make more of those

http://merkel.zoneo.net/Topo/Applet/

148 posted on 01/30/2008 4:22:21 PM PST by Centurion2000
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To: Sherman Logan

That’s kinda my point.


149 posted on 01/30/2008 4:23:14 PM PST by TheThirdRuffian (Don't blame me; I will write in Thompson.)
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To: potlatch

.

Recessive gene for you

Unless the hospital swapped babies!


150 posted on 01/30/2008 4:23:52 PM PST by devolve (---- - Hey Boone! - My bonus check is late again! -)
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