Question

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

• A. decondensation of chromosomes and reassembly.
• B. Transcription from chromosomes and reassembly of nuclear lamina.
• C. formation of the contractile ring and formation of phragmoplast.
• D. formation of the contractile ring and transcription from chromosomes.

Answer 1

The correct option is A decondensation of chromosomes and reassembly.

After anaphase, when the chromatids have moved towards the opposite poles, furrowing starts in an animal cell to separate the two cells. Before the nuclear membrane reappears, the chromatids decondense and acquire back their chromosome original state and reassemble themselves. After that, the nuclear membrane is developed to enclose the chromatin material and separate it from the cytoplasm. Since the cell division is in progress, the transcription process cannot take place.

So, the correct option is 'decondensation of chromosomes and reassembly'.