2nd October 2019


Can a person have two dominant alleles?

Organisms that reproduce sexually have two copies of each gene, one from each parent. These matching gene pairs are called alleles. The alleles are homozygous if they code for the same trait and heterozygous if they code for different traits. A homozygous pair might have two dominant or two recessive alleles.

Regarding this, what does it mean for an allele to be dominant over another allele?

The simplest situation of dominant and recessive alleles is if one allele makes a broken protein. When this happens, the working protein is usually dominant. The broken protein doesn't do anything, so the working protein wins out. If both copies of your MC1R gene code for broken proteins, then you'll have red hair.
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