Mitosis is the separating of a cell's nucleus while passing on the same chromosomes to each of the two daughter cells. Before this all occurs, interphase, or a part of the cell life cycle, occurs in which all the DNA is replicated in each of the 46 chromosomes in the nucleus. Also in interphase, the cell grows and develops and also carries out the functions of life. Once that occurs, mitosis begins. The first phase of mitosis is called prophase. In it, the DNA strands throughout the nucleus condense around histones into chromatids, and two chromatids attach to create a replicated chromosome. Each of those chromatids are identical in DNA sequence. Also, the nucleus begins to breakdown. Then spindle microtubules attach to each of the chromatids and also things called centrioles that move to the east and west poles of the cell. In the next phase of metaphase, the microtubules line up the chromosomes along the metaphase plate or a line down the middle of the cell. In anaphase, the microtubules from the left and right pull apart the identical chromatids and pull their chromatid towards the pole of the cell. Lastly, in telephase, the chromatids arrive at the poles of the cell and the border of the cell, or the cell membrane, begins to close to create two different cells. Also, the nucleus begins to reform. After mitosis, cytokinesis occurs in which the organelles and the cytoplasm of the cell divide in two and then the cell membrane completely pinches into two different cells. All this is known as the cell's life span, but the great detail of this paper is on the process of mitosis. .