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Red hair (or ginger hair) occurs naturally in 1–2% of the human population.It occurs more frequently (2–6%) in people of northern or western European ancestry, and less frequently in other populations.
It is associated with fair skin color, lighter eye colors (gray, blue, green, and hazel), freckles, and sensitivity to ultraviolet light.
In Asia, genetic red hair is rare, but reddish-brown (auburn) hair can be found in the Levant (Syria, Lebanon, Jordan, Israel and Palestine), in Turkey, in Caucasia, in Northern Kazakhstan, among Uyghurs and among Indo-Iranians.
The use of henna on hair and skin for various reasons occasionally occurs in Asia.
The non-tanning skin associated with red hair may have been advantageous in far-northern climates where sunlight is scarce.
Studies by Bodmer and Cavalli-Sforza (1976) hypothesized that lighter skin pigmentation prevents rickets in colder climates by encouraging higher levels of Vitamin D production and also allows the individual to retain heat better than someone with darker skin. concluded that red hair is not the result of positive selection but of a lack of negative selection.
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