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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.
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.
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.
The genetics of red hair, discovered in 1997, appear to be associated with the melanocortin-1 receptor (MC1R), which is found on chromosome 16.
Red hair is associated with fair skin color because low concentrations of eumelanin throughout the body of those with red hair caused by a MC1R mutation can cause both.
In Africa, for example, red hair is selected against because high levels of sun harm untanned skin.
However, in Northern Europe this does not happen, so redheads can become more common through genetic drift.
Eighty percent of redheads have an MC1R gene variant.
Red hair can originate from several changes on the MC1R-gene.
Even if both parents do not have red hair themselves, both can be carriers for the gene and have a redheaded child.
Genetic studies of dizygotic (fraternal) twins indicate that the MC1R gene is not solely responsible for the red hair phenotype; unidentified modifier genes exist, making variance in the MC1R gene necessary, but not always sufficient, for red hair production.
In species other than primates, red hair has different genetic origins and mechanisms.Tags: Adult Dating, affair dating, sex dating