Question

In humans, having bushy eyebrows (B) is a trait that is dominant over having thin eyebrows (b).
Two parents are going to have a baby. The mother is heterozygous (Bb) for having bushy eyebrows and the father has thin eyebrows (bb).
What can be predicted about the baby's eyebrows?

Answer 1

Based on the provided information, the genotype of the mother is Bb (heterozygous for bushy eyebrows), and the genotype of the father is bb (homozygous for thin eyebrows). Since bushy eyebrows (B) is dominant over thin eyebrows (b), the baby's genotype can be determined by considering the possible combinations of the parent's alleles.

- The mother can pass either B or b allele to the baby, while the father can only pass the b allele.
- Therefore, the possible genotypes for the baby are Bb or bb.

Given that bushy eyebrows (B) is dominant over thin eyebrows (b), even though the baby has the genotype Bb, they will still have bushy eyebrows. Thus, it can be predicted that the baby will have bushy eyebrows.