Study confirming it had American biologist Thomas Telen in 1983. He prepared three series of slides

Some believe it is a side effect of natural selection in favor of svetlaskurastsi. (Light skin facilitates the penetration of sunlight deep into the tissue, accelerating the synthesis supratsrahitychnaga vitamin D, which is synthesized usually slowly in a lack of solar radiation). But skin color have little effect different alleles responsible for eye and hair color (except for those responsible for red hair or blue eyes).
Random factors could not form such a wide diversity in the eye and hair color for those 35,000 years, which is a European living in Europe. So it is necessary to look for non-random factors? Some, including factors of 25 genetics Luigi smith-Sforza this factor factors of 25 is considered sexual selection.
This selection itensifikuetstsa when the number of men exceeds the number of women in the population (or vice versa). The floor, which is prevalent, is in fierce competition. One way to attract attention in this struggle is the application of a more vibrant colors. In this case, attention is drawn not even a "bright" colors and the fact that the partner "stands out" from the crowd.
With success in the struggle for a partner, a person pass on their genes to the next generation, making those unusual features, which managed to attract a mate, more frequency, and thus more "normal", thereby intensifikuyuchy this process of selection of individuals who "stand out from the crowd" more .
Study confirming it had American biologist Thomas Telen in 1983. He prepared three series of slides: one series with six tsyamnyavymi women, the second - on the one tsyamnyavay and five whitish, and the third - the one and eleven tsyamnyavay whitish.
Several men had to choose a woman to each series, with which they would most willingly married. As a result, for the same percentage of women tsyamnyavay choice increased in proportion to how rare was the color of her hair blond among women. Such a mechanism could be the reason that we have among European population such a variety of phenotypes.
A possible answer to the question why such selection is manifested among Europeans is their way of life. The reason factors of 25 for "deficit" of men was their death at a young age, as they had in the former lead stepatundry life of hunters, covering long distances in search of food.
Second, among them was a small percentage of those who have had two or more wives (there were corny difficult to feed: in such natural conditions gathering - female occupation - provides little recoil, factors of 25 and therefore, getting food is produced almost exclusively the responsibility of men) .
Who, then, is in this light that the current blondes? They - carriers of the genes of their grandparents, who lived thousands of years ago and won (probably due to the fact that "stand out from the crowd") in fierce competition with its contemporaries for partners.
The racial makeup of the Belarusians inhomogeneous north-south factors of 25 axis: walking factors of 25 along this axis to the north can be found among the Belarusian population more uskhodnenardyytsav and zahodnebaltydav (synonym for Falskogo dew).
I wonder how, then, can be explained by specific, prevalent in our "jokes about blondes?" Shyness yourself? "Racism", factors of 25 which is aimed not against others, but against his? In our phenotype manifests the blood that flows in our blood grandfathers, great-grandfathers, including those grandparents who won a competition for a partner in stepatundry, and the blood should be valued, not ridicule.
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