In our bodies there are cells which are constantly dying and and multiplying. Cells do not merely appear from thin air, instead dividing themselves through a complex process called mitosis. Mitosis consists of various step by step stages that occur from within the cell. The six stages are called the interphase, prophase, metaphase, anaphase, telophase, and cytokinesis.
The interphase is a preliminary stage for mitosis where chromosomes inside the nucleus duplicate. The duplication of chromosomes inside the nucleus is accompanied by two pairs of centrioles outside of the nucleus which are surrounded by an aster.
In the prophase there are multiple forms of development occurring in the cell. First inside of the nucleus the chromatin becomes bundled into chromosomes. These chromosomes are bundled in two's for the preparation of the final split to form two cells. The second change that occurs in this phase is the separation of the centrioles which are connected by a mitotic spindle made of protein and microtubules. After these two processes occur, a final stage completes the prophase by ridding the nucleus and attaching the sister chromosomes to the mitotic spindle. They are attached to the spindle by a structure called the kinetochore fibers.
The metaphase solely organizes the chromosomes from being scattered throughout the cell to being a perfectly perpendicular to the opposite spindle poles. The chromosomes appear as a dashed horizontal line after the completion of the this stage.
Next, the anaphase separates the sister chromosomes through the motion of the spindle apparatus. Each separated sister chromosome contains an identical chromosome on the opposite side of this cell. The poles of the cells move farther apart displaying two distinct and ready cells still unified but ready for separation.
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