Question

In a cell cycle, crossing over occurs at:

• A. Single strand stage
• B. Two strand stage
• C. Four strand stage
• D. Eight strand stage

Answer 1

The correct option is C Four strand stage

In a cell cycle, crossing over occurs at the four-strand stage. It occurs in the pachytene. The exchange of genetic material between the non-sister chromatids of the bivalent is called crossing over.

So, the correct option is the 'four strand stage'.