NEET Biology Principle Of Inheritance And Variation Question Bank Assertion and Reason

  • question_answer
    Assertion : Phenylketonuria is a recessive hereditary disease caused by body?s failure to oxidise an amino acid phendylanine to tryrosine, because of a defective enzyme. Reason : It results the presence of phenylalanine acid in urine. [AIIMS 2000]

    A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion

    B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion 

    C) If the assertion is true but the reason is false

    D) If both the assertion and reason are false

    E) If the assertion is false but reason is true

    Correct Answer: A

    Solution :

    Phenylketonuria is due to deficency of liver enzyme Phenyanaline hydroxylase which converts phenylanine into tryosine. It occurs in person who are homozygous recessive. It results with a high level of phenylalanine in blood, tissue fluids and urine.


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