Mitosis

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  • Mitosis
    • Interphase
      • The cell carries out normal functions and prepares to divide
        • The cells DNA is unravelled and replicated
        • Organelles are also replicated so the cell has spare ones
        • The cells ATP content increases as ATP provides the energy needed for cell division
    • Stage 1: Prophase
      • The chromosones condense, becoming shorter and fatter
        • Tiny bundles of protein, centrioles, start to move to opposite ends of the cell
        • The moving centrioles cretaes a network of protein fibres across it known as spindle fibres
        • The nuclear envelope breaks down and the chromosones lie free in the cytoplasm
    • Stage 2: Metaphase
      • The chromosones consist of two sister chromatids
        • They chromatids line up along the middle of the cell
        • The sister chromatids attacht too two opposite spindle fibres by their centromere
    • Stage 3: Anaphase
      • The centromere splits, seperating each pair of sister chromatids
        • The spindle fibres contract, pulling the chromatids to opposite poles of the spindle
        • This is done centromere first with the chromatid behind it, appearing v-shaped
    • Stage 4: Telophase
      • The chromatids reach the opposite poles of the spindle
        • They uncoil becoming long and thin again, now called chromosones
        • A nuclear envelope forms around each grup of chromosones,forming two nuclei
    • Stage 5: Cytokenesis
      • The cytoplasm divides
        • There are now two identical daughter cells

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