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It is now hypothesized by researchers that blond hair evolved more than once.
Blond hair tends to turn darker with age, and many children's blond hair turns light, medium, dark brown or black before or during their adult years.
Blond hair is most common in Scandinavia and Baltic Sea countries, where true blondism is believed to have originated.
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 the Eskimos live in, because in the polar climate there is more ice or snow on the ground, and this reflects the solar radiation on to the skin, making this environment lack the conditions for the person have blond, brown or red hair, light skin and blue, gray or green eyes.
According to Frost, the appearance of blond hair and blue eyes in some northern European women made them stand out from their rivals, and more sexually appealing to men, at a time of fierce competition for scarce males.
Recent archaeological and genetic study published in 2014 found that, seven "Scandinavian hunter-gatherers" found in 7700-year-old Motala archaeological site in southern Sweden had both light skin gene variants, SLC24A5 and SLC45A2, they also had a third gene, HERC2/OCA2, which causes blue eyes and also contribute to lighter skin and blond hair.Genetic research published in 20 also indicates that, Yamnaya Proto-Indo-Europeans who migrated to Europe in Bronze Age were overwhelmingly dark-eyed (brown), dark-haired and had a skin colour that was moderately light, though somewhat darker than that of the average modern European.While light pigmentation traits had already existed in pre-Indo-European Europeans (both farmers and hunter-gatherers) and long-standing philological attempts to correlate them with the arrival of Indo-Europeans from the steppes were misguided.On the Fischer–Saller scale, blond color ranges from A (light blond) to O (dark blond).It gradually eclipsed the native term "fair", of same meaning, from Old English fæġer, causing "fair" later to become a general term for "light complexioned"."Blond", with its continued gender-varied usage, is one of few adjectives in written English to retain separate masculine and feminine grammatical genders.