Question

Sharon has blonde hair. Her husband is heterozygous for brown hair, with brown being the dominant autosomal trait. What percent chance will their daughter have blonde hair

Answer 1

50%

Step-by-step explanation:

Sharon's genotype is rr, because blonde is a recessive characteristic, and she must be homozygous recessive to have blonde hair. Her husband is Rr because, in addition to being heterozygous, he has brown hair, which is dominant. When you draw a punnet square, you'll notice that the progeny are Rr, Rr, rr, and rr. As a result, their daughter is 50 percent likely to have brown hair and 50 percent likely to have blonde hair.