Mitosis
- Created by: Chloe Jenson
- Created on: 07-12-17 10:32
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- Mitosis
- Interphase
- Each DNA molecule is converted into two identical ones - chromatins
- Producing enzymes oe hormones while actively preparing for cell division
- 3 stages - G1, S and G2
- DNA is replicated
- Prophase
- 1. Chromatin fibres coil and form chromosomes. Nucleolus dissapears and nulear membrane breaks down.
- 2. Protein microtubles form spindle- shaped structures linking the poles of the cell.
- 3. Two centrioles migrate to opposite poles of the cell. Centrioles are cylindrical bundles of proteins that help in the formation of spindle.
- 4. Spindle fibres attach to specific areas on the centromeres and chromsomes start to move to centre of the cell.
- 5. Nuclear envelope disappears.
- 1. Chromatin fibres coil and form chromosomes. Nucleolus dissapears and nulear membrane breaks down.
- Metaphase
- Chromosomes are moved by spindle fibres to form a plane in the centre of the cell - metaphase plate - then held in position.
- Anaphase
- 1.Centromeres holding together the pairs of chromatidsin each chromosome, divide.
- 2. Chromatids are seperated - pulled to opposite poles of the cell by the shortening spindle fibres.
- 3. V shape of chromatids moving towards poles is a result of them being dragged by their centromeres through the liquid cytosol.
- Telophase
- 1. Chromatids have reached the poles and are now called chromosomes.
- 2. Two new sets of chromosomes assemble at each pole and nuclear envelope begins to form around them.
- 3. Chromosomes start to uncoil and nucleus is formed
- 1. Chromatids have reached the poles and are now called chromosomes.
- Interphase
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