Scientists have yet to suggest that the mutation occurred, and there were a man blue eyes, but some signs indicate that, most likely, it happened a few decades ago.During this period, there was mass colonization of Europe, as agriculture in the Middle East began to spread to the European countries.
Origin
Journal of Human Genetics scientists put a note that the mutation that caused the appearance of the eyes of blue hues, most likely occurred in the northwest of the Black Sea region.
Professor Eiberg was noted that the "default" color human eyes should be brown.Dark blue eyes - the result of a mutation, because darker skin pigment - melanin, affects the appearance of the light brown-eyed babies.However, in Northern Europe OCA2 gene has undergone changes that disrupt the production of melanin in the iris, which has led to the appearance of a blue color.
Professor Eiberg said that brown eyes were first of all, but mutations in our chromosomes gene OCA2 caused the "conversion" that "turn off" the ability of people to produce brown.
in the iris varies the amount of melanin, and therefore different shades of brown.Blue eyes are people who have had a common ancestor, the changed gene.All of them have inherited the same mutation in their DNA.
Blue-eyed men and women have nearly identical genetic sequence of the part of the DNA molecule, which is responsible for eye color.
Professor Eiberg analyzed the DNA of more than 800 people from the white-skinned blond Scandinavians to dark-skinned people, but with blue eyes, living in Turkey and Jordan.His experiment confirmed the hypothesis of a single common ancestor.
unclear why blue eyes are more common among the population of the South of Russia and Northern Europe.Previously it was assumed that this feature gives a certain advantage in the summer midnight sun or the polar winter.Maybe this is considered to be more attractive and therefore more favorable for sexual selection.
Features
Anatomically iris mesodermal and ectodermal includes layer.From how the pigment dispersed therein, and depends on the color.Chromatophores distributed mesodermal layer, they contain melanin.The backing layer contains a lot of pigment cells filled fustsinom.Also plays a role fibers and blood vessels of the iris.
main bright colors - blue, blue and gray.
ectodermal layer inherent in dark blue color.If the outer fibers of the iris have a low density and a low content of melanin, the light is absorbed by the high frequency mesodermal layer and the low-frequency light is reflected from it.Blue eyes - a consequence of this index.
There are people who dream to change your natural color to blue.They believe that the opinion thus gain the beauty, depth and richness.Most often refers to the attractive blue eyes picture blue-eyed people can decorate using some programs, such as Photoshop.After experimenting with computer effects, you can pick out the right make-up and cosmetics.
