Who would have known.
You know all those guys that don't have ginger hair and when they grow a beard it comes out ginger? Like the very talented Christian Bale, for example. Why does it happen?
According to Petra Haak-Bloem, specialist at the Dutch national information centre for genetics and hereditary traits, âThe genes that determine hair color are so-called âincomplete dominant hereditary traits.â This means that there isnât one single gene thatâs dominant over the rest, but all genes influence each other.â
That's why your hair, your facial hair AND your pubes can all have different colors!!
âGenerally speaking, people inherit hair color not only from their parents, but also from their grandparents and earlier ancestors. So itâs entirely possible that one distant ancestor had a hair color that suddenly appears again though a certain combination of genesâand that can be quite unexpected for parents."
âMore than a decade ago, researchers discovered that one gene (MC1R) on chromosome 16 plays an important part in giving people red hair. MC1Râs task is making a protein called melanocortin 1. That proteine plays an important part in converting pheolmelanine into eumelanine,â Haak-Bloem said.
âWhen someone inherits two mutated versions of the MC1R-gene (one from each parent), less pheomelanine is converted into eumelanine. The feomelanine accumulates in the pigment cells and the person ends up with red hair and fair skin.â
This means that the red beards are a mutation in the MC1R gene. When you only have one mutated MC1R, red hair can appear in unexpected places...