Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 10. Cell cycle and cell division1 Mark
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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