Mitosis

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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.
    • 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

Comments

Elisew

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This was really helpful and included the perfect amount of detail, would definitely recommend.

These

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This was really helpful and it helped me pass my A Levels

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