50. What causes red hair? About 1 to 2 percent of the human population has red hair. Redheads have genes to thank for their tresses. Research shows red hair usually results from a mutation in a gene called MC1R, which codes for the melanocortin-1 receptor. The pigment found in redhair that makes it red is called pheomelanin.

50. What causes red hair?

About 1 to 2 percent of the human population has red hair. Redheads have genes to thank for their tresses. Research shows red hair usually results from a mutation in a gene called MC1R, which codes for the melanocortin-1 receptor. The pigment found in redhair that makes it red is called pheomelanin.