Heredity Unit Notes 1/6/09 Mitosis – the process in which a cell produces two identical nuclei. Chromosome – a string – like structure in cells that carries information controlling all the cell’s activities. The Five Steps of Mitosis Step 1: Interphase – Each chromosome makes an exact copy of itself. Step 2: Prophase – The nuclear membrane disappears and the chromosomes attach each other. Step 3: Metaphase – Chromosomes line up in the middle of the cell. Step 4: Anaphase – Chromosomes split to the opposite sides of the cell. Step 5: Telophase – Nuclear membrane reappears and the cell begins to split. Cell Division – is the process in which a cell divides into two daughter cells.