<Tr> <Td> </Td> <Td> </Td> </Tr> <P> Phenylthiocarbamide (PTC), also known as phenylthiourea (PTU), is an organosulfur thiourea containing a phenyl ring . </P> <P> It has the unusual property that it either tastes very bitter or is virtually tasteless, depending on the genetic makeup of the taster . The ability to taste PTC is often treated as a dominant genetic trait, although inheritance and expression of this trait are somewhat more complex . </P> <P> PTC also inhibits melanogenesis and is used to grow transparent fish . </P>

For the trait of ptc tasting is the ability to taste the bitter flavor dominant or recessive