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Phenylketonuria is...

Phenylketonuria is

A

Sex linked dominant trait

B

Sex linked recesive trait

C

Autosomal dominant trait

D

Autosomal recessive trait

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Phenylketonuria (PKU)**: - Phenylketonuria is a genetic disorder that results from the inability of the body to break down the amino acid phenylalanine due to a deficiency of the enzyme phenylalanine hydroxylase. 2. **Inheritance Pattern**: - PKU is classified as an autosomal recessive disorder. This means that an individual must inherit two copies of the mutated gene (one from each parent) to express the disorder. 3. **Genetic Requirement**: - For a child to have PKU, both parents must carry at least one copy of the non-working gene. If both parents are carriers, there is a 25% chance with each pregnancy that their child will inherit PKU. 4. **Distinguishing Between Inheritance Types**: - It is important to note that PKU is not a sex-linked disorder, which would involve genes located on the sex chromosomes. Instead, it is associated with genes on the autosomes (non-sex chromosomes). 5. **Conclusion**: - Therefore, the correct classification of phenylketonuria is that it is an **autosomal recessive trait**. ---
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