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Phenylketonuria is X-linked disease and results in accumulation of phenyl pyruvic acid.

Klinefelter’s syndrome is due to trisomy in 23^rd pair of chromosomes and results in male with gynecomastia.

Down’s syndrome is due to triploidy and results in mental retardation.

Turner’s syndrome is due to trisomy and results in sterile female.

answer is B.

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Detailed Solution

Klinefelter male is formed due to aneuploidy. It occurs due to trisomy in 23^rdpair of chromosomes (XXY). The patient exhibits gynecomastia (enlargement of breasts) and many other feminine characters.

Down’s syndrome results in the gain of extra copy of chromosome 21.

Turner’s Syndrome is caused due to the absence of one of the X chromosomes, i.e., 45 with X0.

Phenylketonuria is an autosomal recessive disorder.

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