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Study the pedigree chart given below: What does it show?

1. Inheritance of a condition like phenylketonuria as an autosomal recessive trait
2. The pedigree chart is wrong as this is not possible
3. Inheritance of a recessive sex-linked disease like haemophilia
4. Inheritance of a sex-linked inborn error of metabolism like phenylketonuria

Correct answer: Inheritance of a condition like phenylketonuria as an autosomal recessive trait

Solution

Phenylketonuria is classically inherited as an autosomal recessive trait, so affected children may be born to unaffected carrier parents. A sex-linked pattern would usually show a sex bias, which is not the key feature here.

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