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 a 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, years ago during the last ice age. 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 they live in, because in the polar climate there is more ice or snow on the ground, and this reflects the solar radiation onto the skin, making this environment lack the conditions for the person to have blond, brown or red hair, light skin and blue, grey or green eyes. 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.
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Marilyn Monroe in Gentlemen Prefer Blondes natural or otherwise. Blonde hair is almost certainly a sexually selected trait in women. This seems to be true of a lot of men. Ask Carole: Chimpanzee wearing spectacles Photograph: Public Domain Carole replies: Ten years after he published On the Origin of Species in , Darwin started to research the sexual selection of blonde hair in women in preparation for his book The Descent of Man and Selection in Relation to Sex , which was published in Unfortunately he was unable to find enough data to support his theory that blonde hair is sexually selected and had to drop the subject.
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