Steven Has the Dominant Tongue Rolling Phenotype but He Does

Multiple Choice

Steven has the dominant tongue rolling phenotype but he does not know his genotype.His wife has the recessive non-tongue rolling trait.If their son cannot roll his tongue this means ________.

A) Steven has a heterozygous genotype
B) that it is impossible to tell Steven's genotype from this information alone
C) Steven has a homozygous dominant genotype
D) Steven has a homozygous recessive genotype