Final answer:
In Phenylketonuria (PKU), an overabundance of phenylalanine can lead to severe neurological symptoms due to the lack of the enzyme needed to convert it into tyrosine.
Step-by-step explanation:
An overabundance of phenylalanine is most likely to result in symptoms seen in Phenylketonuria (PKU). PKU is characterized by insufficient activity of the enzyme phenylalanine hydroxylase, which is necessary for the conversion of phenylalanine to tyrosine. When levels of phenylalanine rise to toxic levels in the body, it can lead to damage to the central nervous system and brain, leading to symptoms such as delayed neurological development, hyperactivity, intellectual disability, seizures, rash, tremors, and uncontrolled movements. It's essential for individuals with PKU to adhere to a strict diet that is low in phenylalanine to prevent these symptoms.