Non-sexual cells divide through a process called mitosis. The cell nucleus divides and replicates the original DNA in a four-step renewal process: prophase, metaphase, anaphase and telophase. Each phase builds upon the former phase, and the result is a renewed replica of the original cell. Sex cells, or gametes, renew themselves in a process called meiosis. This transformation is similar to mitosis but has important variations. Meiosis does not produce the exact DNA copy due to the addition of genetic DNA of another. For example, male and female DNA merges to form a combined mix of chromosomes and cells that become a unique group of cells, known as offspring. Cell division is perpetual in that this complicated process continually repeats throughout the lifetime of an organism. The division and renewal of cells are the building block of life and when this process ends, death is inevitable.
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