Interphase is the stage when the cell is carrying out it's normal activity. Examples of this is:
- Chromosomes replicate
- Organelles are produced
- ATP synthesis occurs
- Protein synthesis occurs
- DNA is doubled
Prophase is the first stage during mitosis.
- The chromosomes become visible due to the chromatin condensing.
- Centrioles move to the opposite pole and start to form spindles
- The nuclear envelope disintegrates
- The nucleolus disappears.
This is the second stage of mitosis.
- The chromosomes arrange themselves at the equator of the cell
- The spindle fibres attach themselves to the centromere.
This is the third stage of mitosis.
- The spindle fibres contract and seperate the sister chromatids and move them to opposie poles
- They are now called sister chromosomes
This is the final stage of mitosis.
- The spindle fibres break down
- The nuclear envelope re-forms and the nucleolus reappears.
- The chromosomes uncoil and lenghten to form chromatin
At the end of telophase the cell splits (cytokinesis) to form two identicle daughter cells
SIGNIFICANCE OF MITOSIS
- Repair and replace cells and tissues
- It is important in the growth of organisms
- Asexual reproduction e.g. plants
- Genetic stability - produces identicle offspirng
- Two identicle daugher cells
- Diploid daughter cells produced.