Mitosis
Mitosis is the replication of cells to create an identical copy. It is used when more cells are needed to replace damaged or lost cells. The process of mitosis stars in the nucleus. The chromosomes in the nucleus replicate and are then attached to each other by a little button called a centromere. The nucleus then dissolves leaving the chromatid pairs floating around in the cell. Then, all of the chromatids line up down the middle of the cell and the centrioles attach spindle fibers to them. The spindle fibers then break the centromeres and pull the chromatids apart. Once the chromosomes are pulled away from each other, the process of cytokinesis takes place, separating the cell into two identical cells. The nucleus then reforms and then the process is over. 
This whole process happens millions of times to replicate enough cells to replace the damaged or lost ones, and it all happens fairly quickly. I found it interesting that all of the DNA can be replicated so quickly, based on the amount of DNA in a cell, it would seem that this process would take a a long time.
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http://creationwiki.org/Mitosis
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