Which of the following disease results from the genetic inability to synthesize a single enzyme?

Colour blindness

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Down’s syndrome

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Phenylketonuria

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Diabetes

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Solution

The correct option is C Phenylketonuria
Phenylketonuria is caused by a mutated gene for the enzyme phenylalanine hydroxylase (PAH), which converts the amino acid phenylalanine to other essential compounds in the body, in particular tyrosine.

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