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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation1 Mark
MCQ
Chromosome complement with 2n − 1 is called as
  • A
    Monosomy
  • B
    Nullisomy
  • C
    Trisomy
  • D
    Tetrasomy
✓

Answer

  1. Monosomy

Explanation:

Monosomy is absence of a single chromosome from a diploid cell (2n - 1). Nullisomy is absence of one complete pair of homologous chromosomes (2n - 2). Presence of one chromosome four times is called tetrasomy (2n + 2). A diploid cell with an extra chromosome is trisomic (2n + 1).

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