In humans, the gene for a certain type of hereditary deaf-mute is recessive in relation to the gene for normal hearing.

In humans, the gene for a certain type of hereditary deaf-mute is recessive in relation to the gene for normal hearing. A deaf-mute woman married a man with normal hearing. Their child is deaf and dumb: a) determine the genotype of the woman, her husband and child; b) is this trait inherited according to Mendel’s laws?

a) Deaf-mute – x
Normal gene – y
Mother’s genotype – xx
Father’s genotype – yx
The child’s genotype will be – xx
b) Heredity will occur, with the exception of deaf-dumbness.