Which process specifically describes the division of the nucleus in cell division?

The process that specifically describes the division of the nucleus in cell division is mitosis. During mitosis, a single nucleus divides to form two nuclei, each containing the same number of chromosomes as the original nucleus. This is a crucial step for ensuring that when a cell divides, each daughter cell inherits an identical set of genetic material.

In contrast, meiosis refers to the type of cell division that reduces the chromosome number by half and is essential for producing gametes (sperm and eggs) for sexual reproduction. Cytokinesis is the process that occurs after nuclear division (whether mitosis or meiosis), where the cytoplasm of the parent cell divides, resulting in the formation of two distinct daughter cells. Interphase is the phase before cell division, where the cell grows, replicates its DNA, and prepares for mitosis or meiosis, but it does not involve the division of the nucleus itself. Thus, mitosis is the correct term that specifically encompasses the division of the nucleus.