In humans, the recessive s gene determines congenital deafness. Hereditarily deaf-mute man married

In humans, the recessive s gene determines congenital deafness. Hereditarily deaf-mute man married a woman with normal hearing. Their child has normal hearing. Determine the genotype of the mother and child.

A deaf-mute man will have a homozygous ss genotype, because otherwise this trait, which belongs to the recessive category, could not be phenotypically realized. This man produces spermatozoa and is able to transmit exclusively the deaf-mute gene to the offspring.

Since the child born to him has normal hearing – he is heterozygous, Ss. The second, dominant gene S, which causes normal hearing, he inherits from a normal hearing mother.

A mother with a normal hearing, producing eggs with the S gene, can be both homo- and heterozygous for the gene for the trait in question. That is, its genotype can be either Ss or SS.

Answer: child – Ss, mother – either SS or Ss.