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This type of inheritance is described as an autosomal recessive mode of inheritance.
When henna is used on hair it dyes the hair to different shades of red.
It occurs more frequently (2–6%) in people of northern or western European ancestry, and less frequently in other populations.
Red hair appears most commonly in people with two copies of a recessive allele on chromosome 16 which produces an altered version of the MC1R protein.
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.
The lower melanin concentration in skin confers the advantage that a sufficient concentration of important Vitamin D can be produced under low light conditions.
It is associated with fair skin color, lighter eye colors (gray, blue, green, and hazel), freckles, and sensitivity to ultraviolet light.