A child has inherited a dominant trait for straight hair (S) from one parent and a recessive trait for wavy hair from the other parent. Which describes the child’s genotype and alleles for hair type?

The child inherited the dominant straight-hair allele S from one parent and the recessive wavy-hair allele s from the other. The genotype is therefore Ss, with two different alleles, making the child heterozygous. Choice B, “heterozygous, Ss,” is correct.

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