What would happen in a situation where 1 parent has red hair and one has blond hair? Would that pretty much be the same as 2 red-haired parents or would it just make a strawberry blonde more likely?

Answer

The answer to your question is dependent upon the actual genetic mutations found on the MC1R gene. If the blond-haired parent has no mutations on the MC1R gene, the child would only inherit any MC1R mutations from one parent. This would make the child a carrier, and more likely to be blond than have red hair. Genetics, however, is very complicated and if the blond parent is a carrier for mutations on the MC1R gene, then the child could obtain mutations from both parents and have red hair.

The only way to determine the exact probability of the child's hair color would be to know the parent's genotype.

Updated on December 12, 2019

Original Article:

Redheads: The Genetics of Hair Color
By Leah Lefler
working

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