What happens during mitosis?

Mitosis consists of four stages: prophase, metaphase, anaphase and telophase. During prophase, the chromosomes that have already been replciated during interphase become condensed, making them visible under a light microscope. The nuclear envelope degrades and an organelle called the centriole forms the spindle by moving to opposite ends of the cell. Next comes metaphase where the chromosomes line up on the equator (middle region) of the cell and each of these become attached to a spindle via their centromere. The chromosomes then separate during anaphase as they get pulled to opposite poles via the spindle fibres, meaning that each sister chromatid in the chromosome get separated and are both identical copies of the original chromosome present in the parent cell. Next comes telophase where the new nuclear envelopes form around the separated sister chromatids. The spindle fibres get broken down as they are not needed anymore and the chromosomes uncoil. After mitosis, cytokinesis occurs which spilts this whole cell into two new daughter cells which contain identical genetic information to the parent cell.