A certain type of congenital deafness in humans is caused by a rare autosomal recessive gene.In a mating involving a deaf man and a deaf woman,could some of the children have normal hearing?
A)No,because the parents would teach their children sign language.
B)Yes,because it's rare.
C)No,traits get passed down from father to child and the father is deaf.
D)No,since the gene in question is recessive,both of the parents are homozygous and one would not expect normal hearing in the offspring.
E)Yes,because traits assort independently.

Question

Quizplus · Accepted Answer

Since the gene causing deafness is rare and autosomal recessive, both the deaf man and woman must be homozygous for the mutated gene. As a result, all of their offspring will inherit two copies of the mutated gene and have the deafness trait. It is unlikely that any of their children will have normal hearing unless they carry a spontaneous mutation or if there is some sort of genetic reversion.

A Certain Type of Congenital Deafness in Humans Is Caused