Question 1
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? Explain your answer.Question 2
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? Explain your answer.Answer 1
Assuming that the parents are heterozygotes (because the gene is rare), it is possible that all of the children could have normal hearing.Answer 2
Because the gene in question is recessive, both of the parents are homozygous and one would not expect normal hearing in the offspring.