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Which of the following options gives the correct sequence of events during mitosis?

1. Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase
2. Condensation → crossing over → nuclear membrane disassembly → segregation → telophase
3. Condensation → arrangement at equator → centromere division → segregation → telophase
4. Condensation → nuclear membrane disassembly → crossing over → segregation → telophase

Correct answer: Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase

Solution

The correct order follows the main mitotic phases: chromosomes condense, the nuclear membrane breaks down, chromosomes align at the equator, centromeres split, sister chromatids separate, and telophase begins. Crossing over is not part of mitosis; it occurs in meiosis.

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