Question

Which of the following is not a symptom of phenylketonuria?

(a) Mental retardation

(b) Reduction in hair

(c) White urine

(d) Skin pigmentation

The question was posed to me by my college professor while I was bunking the class.

The origin of the question is Inheritance Principles in portion Principles of Inheritance and Variation of Biology – Class 12

Answer 1

The correct answer is (c) White urine

For explanation: White urine is not a symptom of Phenylketonuria. Phenylketonuria is a disease that is caused by a single gene mutation and is characterised by mental retardation, reduction in hair, black urine, and skin pigmentation.