Genetics Expert Explains Why So Many Non-Ginger People Have Ginger Beards
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Beards are in - it seems more people than ever are sporting a tuft of face fuzz. But whereas most of us have come to terms with the fact that it will eventually turn grey, have you ever wondered where those little sprouts of ginger come from?
You may not have a single redhead in the family, yet when you look in the mirror, there it is, an auburn hue glinting in the light.
Well, no, you needn't worry that your mum was having it off with the milkman, because it's all down to your genes.
In order to have red hair, a person needs two copies of the same gene, one from their mum and one from their dad.
However, for a ginger beard, a person needs just one copy of that gene, which means that if either of their parents has it - even if they don't have red hair - then they will end up with a hint of auburn in their facial hair.
The trait can also be passed through several generations, popping up unexpectedly.
Petra Haak-Bloem, from Erfocentrum, the Dutch national information centre for genetics and hereditary traits, told Motherboard in 2015: "Generally speaking, people inherit hair colour not only from their parents, but also from their grandparents and earlier ancestors.
"The genes that determine hair colour 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.
"So it's entirely possible that one distant ancestor had a hair colour that suddenly appears again though a certain combination of genes - and that can be quite unexpected for parents."
Hair colour is determined by two different pigments - eumelanin (black) and pheomelanin (red).
Those with darker hair have the black pigment, while blondes have less black pigment and redheads only have red pigments.
These pigments are all controlled by genetics, however, head hair and facial hair are controlled by different genes.
And scientists have discovered that when a non-red head has a ginger beard, it's because they have a mutated version of the MC1R gene.
Ms Haak-Bloem explained: "MC1R's task is making a protein called melanocortin 1. That protein plays an important part in converting pheolmelanin (the red pigment) into eumelanin (black pigment).
"When someone inherits two mutated versions of the MC1R-gene (one from each parent), less pheomelanin is converted into eumelanine.
"The pheomelanine accumulates in the pigment cells and the person ends up with red hair and fair skin."
Well, you learn something new every day.