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25-Mar-2016 11:43

Red hair varies in hues from a deep burgundy or bright copper (reddish-brown or auburn) through to burnt orange or red-orange and strawberry blond.

It is characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin.

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.

Red hair can originate from several changes on the MC1R-gene.

If one of these changes is present on both chromosomes then the respective individual is likely to have red hair.

The genetics of red hair, discovered in 1997, appear to be associated with the melanocortin-1 receptor (MC1R), which is found on chromosome 16.This type of inheritance is described as an autosomal recessive mode of inheritance.