Question

In humans, pointed eyebrows (B) are dominant over smooth eyebrows (b). Seema’s father has pointed eyebrows, but she and her mother have smooth. What is the genotype of the father?

Options

• BB

• Bb

• bb

• BbBb

Answer 1

Bb

Explanation:

For Seema to have smooth eyebrows (bb), she must inherit one recessive allele from each parent. The father shows the dominant phenotype (pointed eyebrows) but must carry a recessive allele to pass smooth eyebrows to Seema. Hence, his genotype must be heterozygous Bb, not homozygous dominant BB or homozygous recessive bb. The option BbBb is not valid genetics notation.