Before it was believed that only one gene, MC1R, controlled red hair color, but now research shows there are other genes involved. Both parents must carry the redhead gene for a baby to have red hair.

Having red hair and blue eyes is the rarest hair/eye color combination possible. The odds of a person having both of those recessive traits is around 0.17%. Instead, most redheads have brown ...

Less than 2% of the world's population has red hair. The highest concentration of redheads is in Scotland (13%), followed by Ireland (10%). From 2010-2016, the Irish Redhead Convention brought ...