How can a person cannot taste PTC I'd both of their parents have the ability to taste PTC?

the parents are (Tt) and each passed down the recessive allele so the child is  (tt)

Explanation:

lysosomes contain a variety of enzymes, enabling the cell to break down various biomolecules it engulfs, including peptides, nucleic acids, carbohydrates, and lipids (lysosomal lipase). the enzymes responsible for this hydrolysis require an acidic environment for optimal activity. hope i !