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Red heads are rare because they have two copies of the recessive gene on Chromosome 16, which causes a mutant in the MC1R protein. Scientists estimate the original red heads were first bred into the world about 20,000 to 100,000 years ago, much less longer than someone of a different hair colour. It is rare because there were less of them to breed, and of course the outcome of a redhead child depended on the hair colour of the mother and father.

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14y ago

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