Happy Redhead Day!
Red hair is most commonly caused by a series of mutations on the Melanocortin 1 Receptor gene, or MC1R.
Other genetic ways to get red hair:
Worldwide, only 2% of the population has red hair. Red hair and blue eyes is the rares combination in the world at <1%.
“Once in his life, every man is entitled to fall in love with a gorgeous redhead!”
– Lucille Ball