10 Mar Mitosis
▪Mitosis is nuclear division that produces two genetically identical daughter nuclei, each containing the same number of chromosomes as the parent nucleus.
▪Mitosis a controlled process
▪Interphase has G1, S and G2
- the chromosomes condense shorter.
- the centrioles move to opposite ends of the cell which form a network of protein fibres it called spindle.
- the nuclear envelope breaks down.
- the chromosomes line up along the middle of the cell attached to the spindle by their centromere.
- centromere divide which causes the separation of the sister chromatids.
- the spindles contract moving the chromatids to opposite poles of the spindle.
- once the chromatids move to opposite poles of the spindle – these uncoil.
- A nuclear envelope forms around the chromosomes and these become two daughter cells which are genetically identical to the original cell.