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Principles of Inheritance and Variation question

2000 · Q69
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Principles of Inheritance and Variation question

2000 · Q69

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
Mongolian idiots are due to trisomy in 21st chromosome is called :
  1. A
    Kleinfelters syndrome
  2. B
    Down's syndrome
  3. C
    Turner's syndrome
  4. D
    Triplex syndrome
View written solutionFree

Correct answer: B

The condition caused by trisomy in the 21st chromosome is called Down's syndrome. This is Option B

  1. Down's syndrome is characterized by an extra copy of chromosome 21 (trisomy 21), leading to a total of 47 chromosomes instead of the usual 46. It causes a range of physical and developmental characteristics and health issues.
  2. Klinefelter's syndrome (Option A) involves an extra X chromosome (usually XXY instead of the typical XY in males).
  3. Turner's syndrome (Option C) is marked by the presence of only one complete X chromosome (45,X instead of 46,XX or 46,XY).
  4. Triplex syndrome (Option D) is not a recognized chromosomal disorder in medical literature.
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