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Study the pedigree chart given below.

The pedigree chart shows

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inheritance of phenylketonuria as an autosomal recessive trait

inheritance of Klinefelter’s syndrome

male present in generation III is heterozygous and females are homozygous

individuals of generation I are homozygous dominant

answer is C.

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Detailed Solution

The parents of the affected offspring are unaffected suggesting that it is a recessive trait. Phenylketonuria is an autosomal recessive disorder.

Klinefelter’s syndrome is a chromosomal disorder which cannot be attributed to mendelian inheritance.

Individuals of Gen I may be heterozygous.

Male in Gen III is affected and hence is homozygous recessive. Female may be heterozygous or homozygous dominant.

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