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Principles of Inheritance and Variation question

2013 · Q18
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Principles of Inheritance and Variation question

2013 · Q18

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
Down's syndrome in humans is due to :
  1. A
    Three 'X' chromosomes
  2. B
    Monosomy
  3. C
    Three copies of chromosome 21
  4. D
    Two 'Y' chromosomes
View written solutionFree

Correct answer: C

Down’s syndrome is the chromosomal disorders due to the presence of an additional copy of the chromosome number 21 (trisomy of 21). The affected individual is short statured with small round head, furrowed tongue and partially open mouth and mental development is retarted.

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