Biology - Principles of Inheritance and Variation Question with Solution | TestHub
Read the following statement 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 phenylanine
Options:
Answer:
Solution:
Phenylketonuria (PKU) is an inborn error of metabolism that is inherited as an autosomal recessive trait. Thus, statement A is incorrect.
The affected individual lacks the enzyme phenylalanine hydroxylase, which is not produced when the recessive genes are present in a homozygous condition. Thus, statement B is correct.
The enzyme phenylalanine hydroxylase is essential for the conversion of the amino acid phenylalanine into tyrosine, not the other way around. Thus, statement C is incorrect.
Therefore, statement B is correct and A and C are incorrect.
Answer: Statement B is correct and A and C are incorrect
