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In which of the following hereditary disorders, the defective gene cannot be passed from father to son?

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Hypertrichosis

Phenylketonuria

Sickle cell disease

Colour blindness

answer is D.

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Detailed Solution

Hypertrichosis is Y-linked; it is always passed from father to son.

Phenylketonuria and sickle cell anaemia are autosomal disorders; there is probability of these disease traits can be passed from father to son.

In colour blindness, the male gets the defective gene from female parent (not form the father).

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