During the cell cycle, an important part is mitosis. In mitosis, the chromosomes are replicated and there are two new nuclei that are formed. The mitosis is preceeded by interphase stage S. This is the stage during which the DNA gets replicated and this stage often is also accompanied by cytokinesis. At times, the stage can be followed by cytokinesis. In Cytokinesis, the components of the cell such as the cytoplasm, the cell chromosome and the organelles are divided into two new cells and the amount of components which each receives is roughly equal. Together mitosis as well as cytokinesis form what is known as the Mitotic phase.
The process of mitosis has various stages. The stages are based on the completion of certain activities. The various stages are the prophase, prometaphase, metaphase, anaphase as well as telophase. During this the chromosomes which already are duplicated, are then condensed and attached to fibers which are spindle like and the chromosomes are pulled to the ends of the cell by these. The resultant effect is that two daughter cells are created which are identical to each other. The cell contents then continues to divide and two complete working daughter cells are then created.
When instead of two, three daughter cells are created, or in some cases more than 3 daughter cells are created, then this is known as a mitotic error and this is also known as tripolar mitosis or in cases of more than 3, multipolar mitosis. This causes programmed cell death or it is the cause of mutations being formed. Some kinds of cancer are a result of such mutations.
Cells which do not have a nucleus when they divide it is called as binary fission and this is a method of reproduction. There are open mitosis and closed mitosis which occur as well.