Question

Gene P and Q are necessary for normal hearing. A deaf man marries a deaf woman and all their children have normal hearing; the genotypes of parents are

• A. PPqq $\times$ PPqq
• B. Ppqq $\times$ ppQq
• C. PPqq $\times$ ppQQ
• D. ppQQ $\times$ ppQq

Answer 1

Answer: (C)

PPqq $\times$ ppQQ

Gene P and Q are necessary for normal hearing. A deaf man marries a deaf woman. They produce children who are capable of normal hearing. In order to hear properly, all the offsprings must have delivered one dominant gene of P and Q from their parents. So, the correct genotype of the mother and father will be PPqq x ppQQ.

Thus, the correct answer is option C.