One of the first medical tests a newborn receives determines if the child has phenylketonuria (PKU).PKU is the result of a mutation in a single gene that causes mental retardation and a host of other phenotypes (light hair and skin color,eczema,and a "mousy" smell).By detecting PKU early,doctors are able to reduce the effect of this condition with a modified diet.PKU is an example of
A) epistasis.
B) a polygenic trait.
C) pleiotropy.
D) codominance.

Question

Quizplus · Accepted Answer

PKU is an example of pleiotropy because a single genetic mutation affects multiple phenotypic traits.

One of the First Medical Tests a Newborn Receives Determines