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Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle?

1. Decondensation from chromosomes, and reassembly of the nuclear lamina
2. Transcription from chromosomes, and reassembly of the nuclear lamina
3. Formation of the contractile ring, and formation of the phragmoplast
4. Formation of the contractile ring, and transcription from chromosomes

Correct answer: Decondensation from chromosomes, and reassembly of the nuclear lamina

Solution

The nuclear envelope re-forms after chromosomes begin decondensing and the nuclear lamina is rebuilt around them. These are hallmark telophase events that restore the nucleus after mitotic separation.

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