A) skin colour
B) phenylketonuria
C) colourblindness
D) ABO blood group
Correct Answer: B
Solution :
[b] The best example for pleiotropy is phenylketonuria. In phenylketonuria, a single gene mutation that codes for enzyme phenylalanine hydroxylase is seen. This manifests itself through phenotypic expression characterised by mental retardation, reduction in hair and skin pigmentation.
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