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STD 11 - 10. Cell cycle and cell division — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 10. Cell cycle and cell division4 Marks
MCQ
Crossing over occurs at
  • A
    Single strand stage
  • B
    Two strand stage
  • ✓
    Four strand stage
  • D
    Eight strand stage
✓

Answer

Correct option: C.
Four strand stage
c
During pachytene substage of prophase$-I$ of meiosis, the chromosomes are tetravalent i.e., contain two chromatids with each chromosome arms. Crossing over during this substage, which involves the exchange of segments between the non-sister chromatid of homologues.

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