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)Yes,assuming that the parents are heterozygotes because the gene is rare ,it is possible that all of the children could have normal hearing.
B)No,because it is dominant.Children always get the dominant alleles.
C)Yes,because it must be recessive if it's rare.
D)Yes,because traits assort independently.
E)No,because children favor their parents.

Question

Quizplus · Accepted Answer

Since the gene is rare, it is more likely that both parents are heterozygotes carrying one normal and one mutated allele. If the children inherit the normal allele from both parents, they would not have the deafness phenotype. Therefore, it is possible for all the children to have normal hearing.

A Certain Type of Congenital Deafness in Humans Is Caused