Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxid

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4.Principles of Inheritance and Variation

normal

Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme.

Reason : It results in the presence of phenylalanine acid in urine.

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

If the Assertion is correct but Reason is incorrect.

If both the Assertion and Reason are incorrect.

(AIIMS-2000)

Solution

Phenylketonuria is an recessive autosomal gene disorder. It occurs due to the absence of enzyme phenylalanine hydroxylase which changes phenylalanine to tyrosine.

Standard 12

Biology

Sex-linked genes of man are

normal

Haemophilia is a

normal

When different alleles of the same gene are present on an individual, the individual is a

normal

Example of intergenic gene interaction is$/$are

normal

Loss or gain of a segment of $DNA$ results in

normal

Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme. Reason : It results in the presence of phenylalanine acid in urine.

Solution

Similar Questions

Sex-linked genes of man are

Haemophilia is a

When different alleles of the same gene are present on an individual, the individual is a

Example of intergenic gene interaction is$/$are

Loss or gain of a segment of $DNA$ results in

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Assertion : Phenylketonuria is a recessive hereditary disease caused by body’s failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme.

Reason : It results in the presence of phenylalanine acid in urine.