Meiosis is a special type of cell division that produces the egg and sperm cells. It has a different process to normal cell division (mitosis) because the sperm and egg are haploid cells so they only need half the DNA of normal cells. One cell that undergoes meiosis will produce four haploid cells because meiosis contains two cell divisions. This process also involves chromosomal cross-over which "mixes up" the genes and is one of the reasons everyone’s DNA is unique.
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