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No Single Gene For Eye Color, Researchers Prove
Science Daily ^ | 2-25-2007 | University Of Queensland

Posted on 02/25/2007 4:34:29 PM PST by blam

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To: martin_fierro

Liu Chung

21 posted on 02/25/2007 6:50:55 PM PST by SunkenCiv (I last updated my profile on Thursday, February 19, 2007. https://secure.freerepublic.com/donate/)
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To: blam

I could have told them for $5.


22 posted on 02/25/2007 7:11:05 PM PST by LtdGovt ("Where government moves in, community retreats and civil society disintegrates" -Janice Rogers Brown)
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To: blam
I have been telling my General Biology students this for years. Eye color is an example of what geneticists call "continuous variation" and is due to polygenic traits. Such traits show variation that when graphed takes the shape of a bell curve (normal distribution). Human eye color can range from very light blue to so brown as to be almost black. Polygenic traits, by definition, are controlled by more than one gene. They may also be affected by environment, as in the case of human height.

I still use the brown/blue eye color example with my students because it is easy for them to understand and relate to, but I always tell them that eye color in humans is really more complicated than that!
23 posted on 02/25/2007 7:13:42 PM PST by srmorton (Choose life!)
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To: muawiyah

My mom has brown, my dad had gray. One sister has gray, one has brown and I have deep blue go figure.


24 posted on 02/25/2007 7:14:16 PM PST by redangus
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To: blam

Michael Behe said there are no genes for eyes.

Their structure is controlled by mousetraps.


25 posted on 02/25/2007 7:15:35 PM PST by <1/1,000,000th%
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To: muawiyah
"3. you're from Kentucky, named "Harris" and have blue skin (which is real ~ and treatable)."

The Blue People Of Troublesome Creek

26 posted on 02/25/2007 7:18:56 PM PST by blam
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To: Grizzled Bear

My husband's eyes are normally brown. Several time when he has gotten ill (auto immune) they turn a lovely green.

But I'm relieved when they return to brown. :-)


27 posted on 02/25/2007 7:20:27 PM PST by pinz-n-needlez (Jack Bauer wears Tony Snow pajamas)
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To: blam

I have brown eyes. My husband has brown eyes. All our kids have brown eyes. But we both have grandparents who had blue eyes.

My daughter married a green-eyed guy, and their kids have blue eyes.

My son married a green-eyed girl, and their kids have hazel eyes.

My son married a brown-eyed gal, and their kids have eyes so dark they are BLACK.


28 posted on 02/25/2007 7:24:22 PM PST by Alouette (Learned Mother of Zion)
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To: blam

same here...both my parents had blue eyes, I have a light green, hubby has brown..one son and one daughter have deep blue and one daughter has hazel. hhmmm. Now our new grand daughter has deep blue eyes, when the daughter that had her is the hazel and daddy is dark brown eyes.


29 posted on 02/25/2007 7:47:10 PM PST by Jewels1091
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To: Alouette

I have brown ones. I have an interesting problem. I can't smell red-haired women. Is it that they are sneaky?


30 posted on 02/25/2007 8:00:15 PM PST by BobS
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To: blam

What I want to see is a study linking Rh negative blood with blue eye color. Those genes have to be related somehow. Negative blood is geographically peculiar it's not evenly distributed at all, not even across the West.

And where it IS concentrated, there one remarks blue eyes.

Ireland and Brittany are obvious. Less obvious is also a subset of the Berber tribes in the Atlas Mountains of North Africa. Certain of the Berbers are swarthy with blue eyes, a rather shocking combination. The other strange place is among certain Sephardic Jews of Spain and, of course, Israel (though which direction that population flow occurred is much open to question). Blue-eyed Sephardic Jews is a strange thing...the dark-and-light business again, like the Berbers.

Anyway, I would like to see whatever cross-references there are regarding negative blood and eye color. Intuitively, when I think about the negative-blooded people I have known, the correlation is very, very high.


31 posted on 02/25/2007 8:15:21 PM PST by Vicomte13 (Et alors?)
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To: Vicomte13
"Ireland and Brittany are obvious. Less obvious is also a subset of the Berber tribes in the Atlas Mountains of North Africa."

The Berbers are related to the Sa'ami.

O and A blood types are distributed in about equal amounts across Europe. There is a higher % of O type blood concentrated in Wales though.

32 posted on 02/25/2007 8:22:48 PM PST by blam
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To: blam

O and A are, yes, but Rh negative blood isn't.

Rh negative blood is essentially non-existent outside of Europe, a little slice of North Africa, a slice of Israel, and parts of the New World.

Within Europe, it's highest concentration is in the Basque country, with Ireland a close second and Wales and Brittany behind them. Interestingly, there is NOT much of a concentration in the intermediate lands, nor in surrounding Spain, France, Italy, Germany or further East. Not much in England or Scotland, but a lot in Ireland and Wales. (Essentially, this tells us that the trait arrived by boat, and gives a strong boost to the ancient Irish "Milesian" legend, which said that the Irish actually sailed from what is now Spain in a fleet commanded by a leader named Miletus. If that sailing were from the Basque country, it follows a straight line across the Bay of Biscay to Brittany, Wales and Ireland, bypassing everything else.

But then you've got that outcropping of negative blood among a certain Berber tribe in the Atlas Mountains (only), and it's practical non-existence elsewhere. Amongst the Jews is easier to fathom, given their pelerinations and intermarriage over the centuries. Still, it's a RECESSIVE trait, which gives pause.

Anyway, it's a queer thing.


33 posted on 02/25/2007 8:29:36 PM PST by Vicomte13 (Et alors?)
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To: muawiyah; pinz-n-needlez
muawiyah - Let me guess: ...

pinz-n-needlez - But I'm relieved when they return to brown. :-)




No build up of heme or need for dialysis and I am from Detroit.

My eyes change from a pale blue to a deep green with a little gold. When I get angry they have gone to gray to a charcoal/near black color.

pinz; I'm glad your husband is well (ref - post 27)

muawiyah; where does the blue come from, the tidy bowl man?

GB
34 posted on 02/25/2007 8:39:19 PM PST by Grizzled Bear ("Does not play well with others.")
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To: Vicomte13
You'd enjoy this book if you like this sort of thing.

Oppenheimer says that the DNA of the British is ancient, 85% of the Brit's DNA arrived as early as 12k years ago. Now, 9,000 year old, Cheddar Man's (found in the UK) DNA is U5 which is the dominant line of the Sa'ami.

35 posted on 02/25/2007 8:45:34 PM PST by blam
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To: Grizzled Bear

Thank you. :-)

Go Tigers! (I'm from Toledo)


36 posted on 02/25/2007 8:47:17 PM PST by pinz-n-needlez (Jack Bauer wears Tony Snow pajamas)
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To: Vicomte13
Also, go here and click on 'genetic markers' then look to the right column and pick a halpogroup to follow. Use the curser to 'highlight' the arrows on the map.
37 posted on 02/25/2007 8:48:24 PM PST by blam
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To: pinz-n-needlez
I had posted to your post and muawiyah's post # 19 at the same time. That's why I said where I am from.

I've traveled a lot and know of (but never met) only one other person with eyes that change color.

Did your husband fully recover? That must have been scary!
38 posted on 02/25/2007 8:58:06 PM PST by Grizzled Bear ("Does not play well with others.")
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To: BobS
I can't smell red-haired women.



Maybe you should ask them more politely.
39 posted on 02/25/2007 8:59:27 PM PST by Grizzled Bear ("Does not play well with others.")
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To: leda
i have brown eyes. my dad has brown eyes and my mom has hazel eyes. pat has blue eyes. his parents both have blue eyes. all three of our kids have... blue eyes!

Not so odd. You got a recessive blue gene from one of your parents. Your recessive blue matched up with your husband's blue three times (against the odds, but not hugely so) to give blue-eyed children.

40 posted on 02/25/2007 9:02:39 PM PST by poindexter
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