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NEET2008ZoologyPrinciples of Inheritance and VariationActual

Which one of the following condition in humans is correctly matched with its chromosomal abnormality/linkage?

Options

  1. AKlinefelter's syndrome-44 autosomes + XXY
  2. BColourblindness - Y-linked
  3. CErythroblastosis foetalis-X-linked
  4. DDown syndrome-44 autosomes + XO

Correct answer

A. Klinefelter's syndrome-44 autosomes + XXY

Step-by-step solution

Klinefelter's syndrome is represented by 44 autosomes + XXY. When an abnormal egg with XX chromosome is fertilized by a sperm carrying Y-chromosome a zygote having XXY sex chromosomes is formed. The resulting young one is an abnormal sterile male. The 44 autosome + XO condition is due to Turner's syndrome. Such females are sterile and have short stature, webbed neck, broad shield-shaped chest etc. Down's syndrome is due to trisomy of 21^ st pair of chromosome. It is characterised by moderate mental retardation, lar

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