6th December 2019


How does red hair get passed on?

A single gene can explain the fair skin and red hair (and eventual freckles). The job of MC1R is to turn red pigment into brown. When you have no working MC1R, you build up red pigment and have red hair. Each parent has a 50% chance of passing down an R and a 50% chance of passing down an r.

Is brown hair or red hair more dominant?

Red hair is a recessive gene, so your husband has two red hair genes. The only way for your child to have red hair is if you have a recessive red gene (being covered by the dominant brown hair gene) and that is the gene that gets passed onto the baby.
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