A certain type of congenital deafness in humans is caused by a rare autosomal dominant gene. In a mating involving a deaf man and a deaf woman, could all the children have normal hearing?
A) No, because it is dominant. Children always get the dominant alleles.
B) Yes, because traits assort independently.
C) No, because children favor their parents.
D) Yes, because it must be recessive if it's rare.
E) Yes, assuming that the parents are heterozygotes (because the gene is rare), it is possible that all of the children could have normal hearing.
Answer: E
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