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Evolution of blond hair
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 information 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 deficiency of sunlight. 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 sunlight, 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. As seafood is high in vitamin D, vitamin D deficiency would not create a selective pressure for lighter pigmentation in that population.
An alternative hypothesis was presented by Canadian anthropologist Peter Frost, under the aegis of University of St Andrews, who published a study in March 2006 in the journal Evolution and Human Behavior. Frost said blond hair evolved very quickly in a specific area at the end of the last ice age by means of sexual selection. According to the study, 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. The study argues that blond hair was produced higher in the Cro-Magnon descended population of the European region because of food shortages 10,000-11,000 years ago following the last glacial period when most of it was covered by steppe-tundra. Almost the only sustenance in northern Europe came from roaming herds of mammoths, reindeer, bison and horses and finding them required long, arduous hunting trips in which numerous males died, leading to a high ratio of surviving women to men. This hypothesis argues that women with blond hair posed an alternative that helped them mate and thus increased the number of blonds.