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) Yes, because it's rare.
B) No, because the parents would teach their children sign language.
C) Yes, because traits assort independently.
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) No, traits get passed down from father to child and the father is deaf.
Answer: D
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