And here are more fascinating facts about redheads: The reason red is the rarest hair color, according to Dr. Kaplan, is that, of the nine variants in the MC1R gene, only three are associated with ...

While the odds of having red hair and green eyes depends on a variety of factors, it’s interesting to look at the genetics behind this combination. Each person’s DNA includes 20,000 genes.

Rarest kind of redhead 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%.