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23rd June 2018
04:30pm BST
"The genes that determine hair color are so-called 'incomplete dominant hereditary traits'.
"This means that there isn't one single gene that's dominant over the rest, but all genes influence each other," Petra told the publication.
"Generally speaking, people inherit hair colour not only from their parents, but also from their grandparents and earlier ancestors.
“The [pheomelanine gene is mutated] and accumulates in the pigment cells and the person ends up with red hair and fair skin.”
However, if a person has just one of the mutated genes, red hair can appear in sporadic places around the body as a result.
And so, men can end up with red hairs in their beards, on their eyebrows or even on their chests.
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