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

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
Select incorrect sentence for down's syndrome
  • A
    Chromosomal disorder
  • B
    Trisomy of $21^{th}$ pair
  • C
    Mental development is retarded
  • ✓
    It occurs due to crossing over
✓

Answer

Correct option: D.
It occurs due to crossing over
d

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