Hot Blondes -

Blonde hair is caused by a mutation in the TYR (tyrosinase) gene or the OCA2 (oculocutaneous albinism type 2) gene. These genes are responsible for producing the enzyme tyrosinase, which plays a crucial role in the production of melanin, the pigment responsible for hair color. Individuals with blonde hair typically have a mutation that leads to a reduction in the amount of eumelanin (brown/black pigment) produced, resulting in a lighter hair color.