Phenylketonuria (PKU) is caused by a mutation in a gene and results in an inability to digest certain foods. Children born with PKU must eat a special
diet or they will develop symptoms of the disorder such as seizures,
smaller-sized heads, and learning disabilities. PKU is inherited as a
recessive trait. Which statement correctly pairs an argument about the
mutation with evidence that supports the argument?*
A. The mutation is harmful. PKU is inherited as a recessive trait.
B. The mutation is harmful. Individuals with PKU can have severe health problems.
C. The mutation is neutral, PKU can be managed with a strict diet.
D. The mutation is beneficial. Individuals with PKU have smaller-sized heads.