Disintegration of nuclear membrane
Prophase is the stage of the cell cycle during which chromatin condensation to chromosomes begins. Besides, disintegration of the nuclear envelope and the dissolution of the nucleolus occur in late prophase.
Final answer: Late prophase.
Appearance of nucleolus
Telophase is marked by the reappearance of the nucleolus as well as the nuclear envelope around the chromosome at the opposite poles. Chromosomes get decondensed to form chromatin.
Final answer: Telophase.
In anaphase, the centromere of the chromosome divides, leading to the separation of sister chromatids containing duplicated DNA.
Final answer: Anaphase.
The S phase or synthetic phase of the cell cycle is marked by the replication of DNA. Duplication of centrioles also takes place in the cytoplasm during the S phase.
Final answer: S phase.