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Option 3 : Both I and III 

  • Klinefelter Syndrome is a condition in which a male possesses an extra X chromosome (XXY) which renders him female characteristics like less body hair, larger breasts, etc. 
  • Turner's Syndrome is a condition in which, one X chromosome is absent in females resulting in lack of secondary sexual character in that female. 
  • In Down's Syndrome, an extra chromosome is added to the 21st autosomal chromosome and it results in a person becoming mentally retarded or having abnormal physical structure. 
  • Therefore, only I and III are associated with the addition of a chromosome in the human body.
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