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NEETZoologyPrinciples of Inheritance and Variation

Match List I with List II. List I List II A. Down's syndrome I. 45 with X0 B. Klinefelter's syndrome II. Failure of cytokinesis C. Turner's syndrome III. Trisomy 21 D. Polyploidy IV. 47, XXY Choose the correct answer from the options given below:

Options

  1. AA - III, B - IV, C - I, D - II
  2. BA - III, B - I, C - IV, D - II
  3. CA - II, B - IV, C - I, D - III
  4. DA - IV, B - III, C - II, D - I

Correct answer

A. A - III, B - IV, C - I, D - II

Step-by-step solution

According to NCERT, Down's syndrome is an autosomal aneuploidy caused by an additional copy of chromosome number 21 (Trisomy 21). Klinefelter's syndrome is caused by the presence of an additional copy of the X-chromosome resulting in a karyotype of 47, XXY. Turner's syndrome is caused by the absence of one of the X chromosomes, resulting in a karyotype of 45 with X0. Polyploidy is a condition where a whole extra set of chromosomes is present, which arises due to the failure of cytokinesis after the telophase stage

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