Study the given pedigree chart.

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(A) $1$. In the given pedigree,the parents are unaffected (unshaded),but they have an affected (shaded) offspring. This indicates that the trait is re

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Inheritance of a condition like Phenylketonuria as an autosomal recessive trait.

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(A) $1$. In the given pedigree,the parents are unaffected (unshaded),but they have an affected (shaded) offspring. This indicates that the trait is recessive.$2$. Since the trait appears in both generations and can skip generations,it is likely autosomal recessive.$3$. Phenylketonuria is a well-known example of an autosomal recessive metabolic disorder.$4$. Sex-linked recessive disorders like Haemophilia typically show a criss-cross pattern of inheritance,which is not exclusively depicted here,and the autosomal recessive pattern fits the data perfectly.

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