Which of the following events does not occur during some stages of interphase?

DNA duplication

organelle duplication

increase in cell size

separation of sister chromatids

The correct answer is separation of sister chromatids.

Explanation:

The metabolic phase of the cell cycle is called interphase. It comprises three stages, that is, G1, S, and G2. The main activity of interphase is to assist the cells in its growth and DNA replication, duplication of organelles, and thus, enhancing the cell's size.

In interphase, that is, post S phase, the chromosomes gets paired with each other and give rise to sister chromatids. They get combined with each other with the assistance of cohesin proteins. It is at the metaphase stage, that the cohesin protein gets dissociated apart and thus allows the sister chromatids to get separate from each other.