Question:
Read the following statements with respect to Phenylketonuria (PKU) and select the correct option.
(A). It is an inborn disorder caused due to dominant gene.
(B). When recessive genes are present in homozygous condition, Phenylalanine hydroxylase enzyme is not produced.
(C). This enzyme is essential for conversion of amino acid tyrosine into phenylalanine
Read the following statements with respect to Phenylketonuria (PKU) and select the correct option.
(A). It is an inborn disorder caused due to dominant gene.
(B). When recessive genes are present in homozygous condition, Phenylalanine hydroxylase enzyme is not produced.
(C). This enzyme is essential for conversion of amino acid tyrosine into phenylalanine
(A). It is an inborn disorder caused due to dominant gene.
(B). When recessive genes are present in homozygous condition, Phenylalanine hydroxylase enzyme is not produced.
(C). This enzyme is essential for conversion of amino acid tyrosine into phenylalanine
Show Hint
PKU is an inborn error of metabolism due to a recessive gene that leaves one enzyme missing. Check the gene type and the direction of the reaction.
Updated On: Nov 12, 2026
- Statement A, B are correct and C is incorrect
- Statement B is correct and A and C are incorrect
- Statement A, B and C are incorrect
- Statement A, B and C are correct
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Phenylketonuria is an autosomal recessive inborn error of metabolism.
The enzyme phenylalanine hydroxylase converts the amino acid phenylalanine into tyrosine.
Step 2: Statement A
It is caused by a recessive gene, not a dominant one, so A is incorrect.
Step 3: Statement B
In the homozygous recessive condition the enzyme is not formed, so B is correct.
Step 4: Statement C
The enzyme converts phenylalanine into tyrosine and not the reverse, so C is incorrect.
Final Answer:
Only statement B is correct. \[ \boxed{\text{(B) }\text{Statement B is correct and A and C are incorrect}} \]
Phenylketonuria is an autosomal recessive inborn error of metabolism.
The enzyme phenylalanine hydroxylase converts the amino acid phenylalanine into tyrosine.
Step 2: Statement A
It is caused by a recessive gene, not a dominant one, so A is incorrect.
Step 3: Statement B
In the homozygous recessive condition the enzyme is not formed, so B is correct.
Step 4: Statement C
The enzyme converts phenylalanine into tyrosine and not the reverse, so C is incorrect.
Final Answer:
Only statement B is correct. \[ \boxed{\text{(B) }\text{Statement B is correct and A and C are incorrect}} \]
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