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

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24 Comments

Tity Barrie · July 2, 2017 at 8:23 am

Hi

David · July 2, 2017 at 3:47 am

Brown eyed people rule the world.

Lara Talisa · July 2, 2017 at 1:36 am

All real female beautys in the world has blue eyes or minimum green
Blue eyes are beautyful on woman’s

    Vic Gein · July 4, 2017 at 3:57 pm

    >.> thats stupid brown eyes are lush too

    Lara Talisa · July 4, 2017 at 4:10 pm

    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

    Vic Gein · July 4, 2017 at 4:17 pm

    Really coz almost everyone here has blue eyes :/

    Lara Talisa · July 4, 2017 at 4:24 pm

    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

Lara Talisa · July 2, 2017 at 1:34 am

Shay Freeman · July 1, 2017 at 10:16 pm

It’s a mutation from too much inbreeding that caused blue eyes.

    Vic Gein · July 4, 2017 at 3:57 pm

    No its not but ok ,)

    Shay Freeman · July 4, 2017 at 4:19 pm

    Yes it is Vic GeinBe in. It’s called science specifically genetics.

Ashel Tavo Khan · July 1, 2017 at 9:40 pm

Nothing alien about that you dumbshits

Khrishna Nagessar · July 1, 2017 at 5:34 pm

i beleive ufo are underwater creature living in the oceans

Wilma Hammarström · July 1, 2017 at 4:41 pm

Why do people in Lapland, which belongs to Scandinavia have dark skin and brown eyes then?

    Nellie Pisanello · July 1, 2017 at 6:48 pm

    Bcuz originally they come from the early parts of Indo european parts and ended up in Lappland. And another group ended up in America: Alaska, Canada…

Diane Ciampolillo · July 1, 2017 at 4:31 pm

Lot of incest going on back then

Chip Smith · July 1, 2017 at 2:40 pm

Carole Cali what did I tell you

Mike Marino · July 1, 2017 at 2:38 pm

If it’s for real where the hell are these Ufos at pick me up I want to fly that saucer…

Ebony Elmore · July 1, 2017 at 2:20 pm

Theory and hypothetical not one single shred of evidence.

Flori Mjalti · July 1, 2017 at 2:12 pm

from the White Walkers…

Florin Chiriac · July 1, 2017 at 2:09 pm

Yeah! A Husky dog or a Birman cat! Great science behind this discovery!

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