Two People (Both Heterozygotes)are Able to Taste a Chemical Substance

Multiple Choice

Two people (both heterozygotes) are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T) . The inability to taste PTC is caused by a recessive allele (t) . What proportion of their children would be expected to have the ability to taste PTC?

A) 3/4
B) 1/2
C) All
D) 1/4
E) 2/3