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Class 12BiologyPrinciples of Inheritance and VariationChromosomal disorders
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The number of chromosomes in Down's syndrome is

AIPMT 2005All AIPMT
  • A
    $23^{rd}$ pair with one less $= 45$
  • B
    $21^{st}$ pair with one more $= 47$
  • C
    $17^{th}$ pair with one more $= 47$
  • D
    One extra sex chromosome $= 47$
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Class 12 Questions

Class 12

Biology Questions

Chapter

Principles of Inheritance and Variation

Subtopic

Chromosomal disorders

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