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The best example for pleiotropy is :

(1) ABO Blood group

(2) Skin colour

(3) Phenylketoneuria

(4) Colour Blindness
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Answer (3) Phenylketoneuria

Sol. Pleiotropic gene can exhibit multiple phenotypic expression.

An example of this is the disease phenylketonuria.

ABO blood group – Multiple allelism

Skin colour – Shows polygenic inheritance

Colour blindness – Mendelian disorder

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