Multicellular organisms need cells to divide so that organisms can grow and repair damaged tissue.
Cells divide when:
It is essential that any new cells produced contain genetic information that is identical to the parent cell.
A growing and dividing cell goes through a series of stages called the cell cycle.
The cell undergoes a type of cell division called mitosis.
Before a cell can divide, it must grow and make copies of all the organelles such as mitochondria and ribosomes. The cell must also replicate the chromosomes in the nucleus, then it can divide by mitosis.
During mitosis, the two complete sets of chromosomes are pulled to opposite sides of the cell. Two new nuclei form. Then the cell splits into two daughter cells. These are both genetically identical to the parent cell.