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2nd November 2017
02:55pm GMT

"The genes that determine hair colour are so-called 'incomplete dominant hereditary traits'," she said.
"This means that there isn't one single gene that's dominant over the rest, but all genes influence each other.
"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.
You learn something new everyday!