How mitosis occurs.

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  • Created by: Nick
  • Created on: 26-02-12 20:15


- New cells for growth and repair.

- Human body cells are diploid (2 versions of each chromosome).

- When a cell divides, it makes 2 copies of the original cell : nucleus contains same number of chromosomes as original. (mitosis)

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- In a cell that isn't dividing, DNA is spread out in long strings inside the cell.

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- If the cell is told to divide, it has to duplicate it's DNA (One copy for each new cell).

- The DNA is copied and forms X shaped chromosomes. Each arm is identical (left arm has same DNA as right).

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- The chromosomes line up in the centre of the cell and cell fibres pull them apart

- The two arms of each chromosome go to opposite ends of the cell.

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- Membranes form around each set of chromosomes. 

- They become the nuclei of the 2 cells.

- Lastly the cytoplasm divides.

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- There are now 2 new identical cells.

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