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Q.

The best example for pleiotropy is

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a

ABO Blood group

b

skin colour

c

colour blindness

d

phenylketoneuria

answer is C.

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Detailed Solution

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Pleiotropic gene can exhibit multiple phenotypic expression. An example of pleiotropy is the disease phenylketonuria, which occurs in humans. 
ABO blood group – Multiple allelism, Co-dominance
Skin colour in humans  –  Polygenic inheritance
Colour blindness – Mendelian disorder

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