A man who has normal hearing and has a recessive deafness allele on chromosome 17 marries a woman who also has normal hearing and also has a recessive deafness allele,but this allele is on chromosome 3.The probability that their children will be deaf due to either of these mutated genes is closest to
A)100%.
B)50%.
C)25%.
D)0%.

Question

Quizplus · Accepted Answer

The man and woman each have one recessive allele for deafness on different chromosomes (17 and 3, respectively). Since the alleles are on different chromosomes, they cannot combine to produce a homozygous recessive genotype in their children. Therefore, their children will not be deaf due to these alleles.

A Man Who Has Normal Hearing and Has a Recessive