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If one of these changes is present on both chromosomes then the respective individual is likely to have red hair.
This type of inheritance is described as an autosomal recessive mode of inheritance.
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, especially among the Pashtuns.
Emigration from Europe has multiplied the population of red haired humans in the Americas, Australia, New Zealand and South Africa. the largest population of redheads in the world, at 6 to 18 million, compared to approximately 420,000 in Ireland and 300,000 in Scotland.
In the United States, it is estimated that 2–6% of the population has red hair. In Asia, red hair has been found among the ancient Tocharians, who occupied the Tarim Basin in what is now the northwesternmost province of China.
The term redhead has been in use since at least 1510.Reddish-brown (auburn) hair is also found amongst some Polynesians, and is especially common in some tribes and family groups.In Polynesian culture reddish hair has traditionally been seen as a sign of descent from high-ranking ancestors and a mark of rulership.In species other than primates, red hair has different genetic origins and mechanisms.