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The “DNA Switch” That Links All Blue Eyes To One SINGLE Ancestor

Believe it or not, a single person in Europe is responsible for the development of blue eyes. It happened 6,000-10,000 million years ago as the result of a single genetic mutation. Ol’ blue eyes then spread from Europe around the world, according to researchers at the University of Copenhagen. That genetic mutation did not “make” blue in the iris; rather, it turned off the mechanism which produces brown melanin pigment. “Originally, we all had brown eyes,” says Dr. Hans Eiberg, associate professor in the Department of Cellular and Molecular Medicine at the university. “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.”

“From this we can conclude that all blue-eyed individuals are linked to the same ancestor,” said Eiberg. “They have all inherited the same switch at exactly the same spot in their DNA.” So if blue eyes are the result of a genetic mutation in a single individual, how did the trait spread from just one person to being present in 20 to 40 percent of the populations of some European countries today?

One theory is that blue eyes were immediately considered an attractive feature, causing people to seek mates with blue eyes to have children with, enabling the genetic mutation to multiply.

The finding of this rare mutation, probably dispersed in the rapid wave of colonization that followed the end of the last ice age, highlights one of the great mysteries of human evolution: the oddness of Europeans. Those from Europe and the Near-East have many characteristics that set them apart from the rest of the human race. Not only are Europeans far more likely to have blue eyes (95 per cent in some Scandinavian countries), they also have a far greater range of skin tones and hair color than any other ethnic grouping.

Natural lighter hair colors occur most often in Europe and less frequently in other areas. In Northern European populations, the occurrence of blond hair is very frequent. The hair color gene MC1R has at least seven variants in Europe giving the continent a wide range of hair and eye shades. Based on recent genetic research carried out at three Japanese universities, the date of the genetic mutation that resulted in blond hair in Europe has been isolated to about 11,000 years ago during the last ice age.

A typical explanation found in the scientific literature for the evolution of light hair is related to the requirement for vitamin D synthesis and northern Europe’s seasonal less solar radiation. Lighter skin is due to a low concentration in pigmentation, thus allowing more sunlight to trigger the production of vitamin D. In this way, high frequencies of light hair in northern latitudes are a result of the light skin adaptation to lower levels of solar radiation, which reduces the prevalence of rickets caused by vitamin D deficiency. The darker pigmentation at higher latitudes in certain ethnic groups such as the Inuit is explained by a greater proportion of seafood in their diet and by the climate which the Eskimos live in, because in the polar climate there is more ice or snow on the ground, and this reflects the solar radiation on to the skin, making this environment lack the conditions for the person have blond, walnut or red hair, light skin and blue, gray or green eyes. This required condition in climates which have ice on the ground and places that are located in a region which has much or extreme amounts of solar radiation is commonly known as “escape the sun”.

An alternative hypothesis was presented by Canadian anthropologist Peter Frost, who claims blond hair evolved very quickly in a specific area at the end of the last ice age by means of sexual selection. According to Frost, the appearance of blond hair and blue eyes in some northern European women made them stand out from their rivals at a time of fierce competition for scarce males.

 

Source sciencevibe.com

24 Comments

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    • Noooo Blue and Green are the rarest and the beautifulest and the femalest
      Best eyes are colored eyes
      Ja klar Mädel deswegen wollen ja alle diese Kontaktlinsen und lassen sich die Augen helllasern oder implamtate rein machen
      Hahahhahah
      Also ich würde mich auch läsern lassen hätte ich dunkel
      Ich bin stolz auf meine hellen Augen und will auch kein braun drin 😹😹😹also der Ozean oder der Himmel ist schöner als Erde oder Schlamm ….💩
      Aber bei Männern sind dunkle geil
      Ist männlicher 😻😻😻
      Helläugige Männer gefallen mir nicht
      😹😹😹😹jedem sein Typ
      Man will meistens das was man selber nicht hat
      Optische Gegensätze ziehen meistens sehr stark an
      Und ganz selten gibt es auch Frauen die schöne dunkle Augen haben und auch mit Ihnen gutaussehen…aber gibt es

    • Where you staying at
      Brown are the most common eye color worldwide
      And are the oldest
      Blue and Green are neeeew in genetic and Revolution
      They are Mutation
      And Green is the rarest
      I have green yellow and that is much more rare
      But my dream is to have violet green eyes or violet blue 😹😹😹😹😻😻😻😻
      I bet you come from Ireland oder England
      Your face is very English or irish
      Maybe wales
      Greetings
      You are looking cute
      Like a small cute doll with multicolored hair
      Cute
      Cute eyes

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