Question

In humans pointed eyebrows are dominant over smooth eyebrows. Rahul’s father has pointed eyebrows but Rahul and his mother have smooth eyebrows. Predict the following:
a)Genotype of Rahul
b) Genotype of his father and mother
c) If Rahul marries a heterozygous women, what will be the possible genotypes of the progeny and the %probability of their occurance.
Q5. In a paternity suit, where a woman claims that a particular man is the father of her child, the blood types of the three individuals are often tested to see if her claim could be correct. In each of the following cases, determine whether it is possible that the male is the father of the child:

Answer 1

Explanation:

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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