Question

A boy received one dominant allele for brown hair from his father and a recessive allele for blonde hair from his mother. ​Which of the following best describes the boy’s genetic type

Answer 1

Well say the father had the genotype BB (dominant brown) and his mom had the genotype bb (recessive blonde).

If the boy got only one allele of brown hair and his phenotype is brown hair, then his genetic type is Bb

He is heterozygous (has two different alleles). But since brown hair is dominant, his phenotype is brown hair. But he does have the blonde recessive allele.

Hope this helps!