A Woman and a Man Are Both Heterozygous for a Recessive

Multiple Choice

A woman and a man are both heterozygous for a recessive allele for a rare genetic disease. If they have one child, what is the probability that he or she will be affected? If they have two children, what is the probability that at least one of them will be affected?

A) 7/16, 1/4
B) 1/4, 3/4
C) 3/4, 1/4
D) 3/4, 7/16
E) 1/4, 7/16