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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 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.
The earliest known individual with the derived allele is the ANE Afontova Gora 3 individual, dated to 14, years ago. A study reported seven Mesolithzic hunter-gatherers found at Motala , southern Sweden , dated to 7, years ago, as the earliest known individuals in whom the modern Scandinavian phenotype, light skin, blue eyes and blond hair, was combined.
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.
A study published in Science reported a distinct genetic origin of blond hair in people from the Solomon Islands in Melanesia , associated with an amino acid change in TYRP1 produced blond hair.