A Disease Caused by Gene X Is an Autosomal Recessive

Multiple Choice

A disease caused by gene X is an autosomal recessive disease but is modified by expression of a gene on another chromosome gene Y.If gene Y has at least one dominant allele,then the disease is aggressive and becomes evident at age 2.If gene Y has two recessive alleles,then the disease is mild and dormant until the age of 50.Two people who are heterozygous for both gene X and Y have a child.What are the chances the child will have the aggressive form of the disease?

A) 9:16 chance
B) 4:16 chance
C) 3:16 chance
D) 1:16 chance
E) 16:16 chance