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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 XO B. Klinefelter's syndrome II. 47 with XXY C. Turner's syndrome III. 47 , Trisomy 21 Choose the correct answer from the options given below :

Options

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

Correct answer

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

Step-by-step solution

Down's syndrome is an autosomal aneuploidy caused by the presence of an additional copy of chromosome number 21 (Trisomy 21 ), resulting in a total of 47 chromosomes. Klinefelter's syndrome is a sex chromosomal aneuploidy 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 XO . Therefore, the correct match is A-III, B-II, C-I. Answer: A-III, B-II, C-I

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