NEET Biology question

The gene disorder phenylketonuria is an example of

(A)Multiple allelism
(B)Polygenic inheritance
(C)Multiple factor
(D)PleiotropyCorrect

Answer: (D)

Solution

Phenylketonuria, besides causing the primary metabolic defect (accumulation of phenylalanine due to deficient phenylalanine hydroxylase), simultaneously causes multiple other effects — mental retardation, reduced skin/hair pigmentation, and

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Question ID VK-120332