Mitosis is done by your body cells this cartoon illustrates and exception what types of cells do not undergo mitosis

The only cells in the body that do not undergo mitosis are your sex cells or gametes. They undergo a process called Meiosis.

Sperm and egg cells do not go through mitosis, they go through meiosis. Why? Well, in mitosis, cells copy themselves. But in sperm and egg cells, they have to duplicate differently. So, there is no such thing as two different sperm or egg cells that are the same.