Join the Most Relevant JEE Main 2025 Test Series & get 99+ percentile! Join Now
Open MARKS Web Download App
Search any question & find its solution
Question: Answered & Verified by Expert
Assertion : Accumulation of phenyl pyruvic acid in brain results in mental retardation in case of phenylketonuria.
Reason: The affected individual lacks enzyme for the conversion of phenylalanine into tyrosine.
BiologyPrinciples of Inheritance and VariationAIIMSAIIMS 2018 (27 May)
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
1681 Upvotes Verified Answer
The correct answer is: If both assertion and reason are true and reason is the correct explanation of assertion.
Phenylketonuria is an autosomal recessive disease, caused due to mutation in chromosome 7 . In this disease, phenyl pyruvic acid gets accumulated in brain. Affected individual lacks phenylalanine hydroxylase.

Looking for more such questions to practice?

Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.

Use on iOS or Desktop Download from Google Play