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

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Any of the above

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Solution

The correct option is B Bb
Since pointed eyebrow (B) is dominant over smooth eyebrows (b). So, Seema can have smooth eyebrows only if her father is heterozygous for the dominant character. If her father has the genotype Bb and her mother is bb (smooth eyebrows) then her genotype will be either Bb (pointed) or bb(smooth eyebrows). If however, her father is homozygous for the trait the gamete being transferred from him will have the allele B and hence the progeny will only show the genotype Bb for pointed eyebrows. So, the correct option is 'Bb'.

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