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Down's syndrome or Mongoloid idiocy (Mon...

Down's syndrome or Mongoloid idiocy (Mongolism) is due to

A

trisomy off X chromosome

B

trisomy of 21st chromosome

C

nullisomy of a chromosome

D

monosomy of an autosome

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The correct Answer is:
B
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TRUEMAN BIOLOGY-PRINCIPLES OF INHERITANCE AND VARIATIONS -MCQs
  1. Which of the following does not undergo transcription of its genes?

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  2. Turner syndrome is caused by

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  3. Down's syndrome or Mongoloid idiocy (Mongolism) is due to

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  4. Phenylketonuria, Huntington's disease and sickle-cell anaemia are caus...

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  5. Genetic constitution of Klinefelter syndrome is

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  6. Which one of the following conditions through harmful in itself, is al...

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  7. Genetic constitution of superfemale is

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  8. In human beings, male is 44A+XY and female 44A+XX. Which of the follow...

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  9. If the chromosome number of a trisomic is 25 what will be its correspo...

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  10. What would be the sex of Drosophila with 3A+XXY genetic constitution?

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  11. The number of barr bodies in normal male and normal female is

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  12. Turner's syndrome is

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  13. If haploid number is 10, what would be the number of monosomic and tet...

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  14. Down's syndrome is an example of

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  15. Webbed neck' is a characteristic of :

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  16. Barr body in normal female is due to inactivation of

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  17. Carrier organism refers to an individual which carries a

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  18. A woman has haemophilic brother and normal parents. She wants to marry...

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  19. The grandsons of a colour blind male through daughter having the follo...

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  20. If the frequency of a dominant phenotype in a stable population is 75%...

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