What is the function of mitosis in a cell that is about to divide?

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Mitosis is cell division that results in two daughter cells with the same chromosome number as the parent cell. It is a way of manufacturing more cells for growth, or to replace old, worn out cells, for repair.  Mitosis is part of the cell cycle. After interphase occurs, a time when the cell grows and synthesizes what it needs, the cell is ready to undergo mitotic division. Before it does, the DNA has been replicated. Therefore, the number of chromosomes present in the parent cell have been copied, resulting in an additional set of chromosomes. The cell passes through prophase, metaphase, anaphase and telophase. At the end of telophase, the cytoplasm divides by cytokinesis and two daughter cells are the result. They are half the size of the original cell, with the exact amount of chromosomes as the parent cell. 

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