When Examining the Transmission of Phenylketonuria (PKU), a Recessive Trait

When examining the transmission of phenylketonuria (PKU) , a recessive trait, we can clearly identify the __________ when a child is afflicted with PKU. For the child not afflicted with PKU, we can only identify the __________, as the child may or may not be a carrier.

A) genotype; phenotype
B) phenotype; genotype
C) X-linked genes; Y-linked genes
D) Y-linked genes; X-linked genes