Genes A and B are necessary for normal hearing. What is the possible genotype of a normal child of deaf mother/ father?

Genes A and B are necessary for normal hearing. A deaf man marries a deaf woman and all their children have normal hearing. The genotype of the parents are

Genes A and B are necessary for normal hearing. A deaf man marries a deaf woman and all their children have normal hearing. The genotype of the parents are

Gene P and Q are both required in dominant state for normal hearing. A deaf couple has all children with normal hearing. The probable genotype for the couple is

Gene P and Q are both required in dominant state for normal hearing. A deaf couple has all children with normal hearing. The probable genotype for the couple is

A mother with blood group B type has a child with blood group type O .What is the possibilty of the genotypes of that mother and father ?

In humn beings , blue eye colour is recessive to brown eye colou. If a blue eyed man has a brown eyed mother then find: a] What are the possible genotypes of his father? b] What is the genotype of the man and his mother?