A Disease Is Caused by Homozygosity for the G Allele

Multiple Choice

A disease is caused by homozygosity for the g allele (G is the corresponding wild-type allele) .However, the penetrance of the disease is 75%.Two individuals known to be heterozygotes have a child.What is the probability that the child exhibits the disease?

A) 1/4
B) 3/4
C) 1/8
D) 3/16
E) 9/16