Phenylketonuria is
Correct answer: D. Autosomal recessive trait
- A. Sex linked dominant trait
- B. Sex linked recessive trait
- C. Autosomal dominant trait
- D. Autosomal recessive trait
Explanation
Phenylketonuria (PKU) is a rare inherited disorder that causes an amino acid called phenylalanine to build up in the body. PKU is caused by a change in the phenylalanine hydroxylase (PAH) gene. This gene helps create the enzyme needed to break down phenylalanine. PKU is inherited from a person's parents. The disorder is passed down in a recessive pattern, which means that for a child to develop PKU, both parents have to contribute a mutated version of the PAH gene. So option A and C are incorrect. It is found in chromosome 12 i.e. it is autosomal, so Option B is incorrect, and option D is correct.
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