The best example for pleiotropy is

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(C) Pleiotropy occurs when a single gene influences two or more seemingly unrelated phenotypic traits.Phenylketonuria $(PKU)$ is a classic example of

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Phenylketonuria

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(C) Pleiotropy occurs when a single gene influences two or more seemingly unrelated phenotypic traits.Phenylketonuria $(PKU)$ is a classic example of pleiotropy,where a mutation in the gene encoding the enzyme phenylalanine hydroxylase leads to multiple effects,including mental retardation,reduced hair pigmentation,and skin problems.$ABO$ blood group is an example of multiple allelism.Skin colour is an example of polygenic inheritance.Colour blindness is a sex-linked Mendelian disorder.

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