You would not be able to tell if one parent was a carrier of mutations on the MC1R gene, as heterozygotes often display no features of the mutation they carry. Testing with an over-the-counter test like 23 & Me or Ancestry will not give you this information, as these tests typically only test for the three most common mutations. In addition, there are some genetic variants on the MC1R gene (like R160W) that can cause a person to have red hair with only one copy of the gene. You likely inherited genes from each parent that resulted in your red hair. It is also possible that you have a dominant-negative allele (like R160W) or are a compound heterozygote on the MC1R gene.
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