Question

The following events occur during the various phases of the cell cycle. Name the phase against each of the events.

a. Disintegration of nuclear membrane __________________

b. Appearance of nucleolus ______________________

c. Division of centromere _____________________________

d. Replication of DNA ________________________________

Answer 1

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.

Anaphase

In anaphase, the centromere of the chromosome divides, leading to the separation of sister chromatids containing duplicated DNA.

Final answer: Anaphase.

S phase

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.