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Q.

In humans rolling of tongue is an autosomal dominant trait (R). In a family both the parents have the trait of rolling tongue but their daughter does not show the trait, whereas the sons have the trait of rolling of tongue.
 

 MotherFatherDaughterSon
(a)RrRrrrrr
(b)RrRrrrRR
(c)rrRrRRrr
(d)RRrrRrRr

 

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a

d

b

b

c

c

d

a

answer is B.

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Detailed Solution

Father Rr X Rr Mother
Gametes: R r X R r

 Rr
RRrRr
rRrrr

If parents are homozygous, one of their progeny is likely to express the trait. Here, son expresses the trait. So the parents will be heterozygotes.

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