Mitosis is the process of cell division that produces two identical daughter cells from a single parent cell. During mitosis, the nucleus divides, and the chromosomes are replicated and distributed evenly to the two daughter cells.
Meiosis is a type of cell division that produces four daughter cells, each with half the number of chromosomes as the parent cell. Meiosis is essential for sexual reproduction, as it creates gametes (sperm and egg cells) that carry half the genetic information of the parent organism.
Therefore, the specific stage within mitosis or meiosis where the nuclear material divides and separates depends on the specific phase of each process. For example, in mitosis, the separation of chromosomes occurs during anaphase. In meiosis, the separation of chromosomes happens in anaphase I and anaphase II.
Therefore, to be more precise, the answer to your question is either anaphase in mitosis or anaphase I and anaphase II in meiosis.