<span>Changes to the genetic makeup of an organism are usually harmful to the organism. Organisms will naturally change their own genetic makeup in response to their environment and conditions affecting them. If an organism is forced to change its genetic makeup, it is usually harmful because the organism will no longer have genes suited for its environment.</span>
Marker/Recognition proteins extend across the cell membrane and serve to identify the cell. The immune system uses these proteins to tell good cells from foreign invaders.
