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Author Topic: do you have BLUE eyes ?  (Read 34 times)

Offline space otter

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do you have BLUE eyes ?
« on: February 07, 2018, 09:33:32 AM »
interesting..is there a contradiction here?

i always add the links so anyone can go read the whole thing




https://www.livescience.com/9578-common-ancestor-blue-eyes.html

One Common Ancestor Behind Blue Eyes
By Jeanna Bryner, Live Science Managing Editor | January 31, 2008 03:34am ET
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. 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.

more at link

.....................

https://www.msn.com/en-us/news/science/dna-suggests-10000-year-old-brit-had-dark-skin-blue-eyes/ar-BBIO5Jn?li=BBnb7Kz

DNA suggests 10,000-year-old Brit had dark skin, blue eyes
Associated Press Associated Press2 hrs agoLONDON — Researchers say DNA from a 10,000-year-old skeleton found in an English cave suggests he had dark skin and blue eyes.

Scientists from Britain's Natural History Museum and University College London have analyzed the genome of "Cheddar Man," who was found in Cheddar Gorge in southwest England in 1903. It is the oldest complete skeleton found in Britain.

Scientists led by museum DNA expert Ian Barnes drilled into the skull to extract DNA from bone powder. They say analysis indicates he had blue eyes, dark curly hair and "dark to black" skin pigmentation.

The researchers said Wednesday that the evidence suggests that Europeans' pale skin tones developed much later than previously thought.

The findings will be shown in a documentary on Britain's Channel 4 television on Feb. 18.









© The Associated Press A full facial reconstruction model of a head based on the skull of Britain's oldest complete skeleton is shown on display during a screening of "The First Brit: Secrets Of The 10,000 Year Old…


« Last Edit: February 07, 2018, 09:35:48 AM by space otter »

 


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