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STD 12 - 4. principal of inheritance and variation — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
Monosomy and trisomy can be represented as
  • A
    $2n + 1, 2n + 3$
  • B
    $2n -1, 2n -2$
  • C
    $2n, 2n + 1$
  • ✓
    $2n -1, 2n + 1$
✓

Answer

Correct option: D.
$2n -1, 2n + 1$
d
(d) When there is loss of one chromosome from a homologous pair $(2n -1)$ called monosomy.

When there is increase of one chromosome in any homologous pair $(2n + 1)$ called trisomy.

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