Mitosis

• Chromosome


  Carries a large number of genes. Different genes determine different characteristics e.g. hair colour
• Humans have two copies of each chromosome
• Humans have 23 pairs of chromosomes
• One copy of each chromosome comes from the organism's 'mother', and one from the organism's 'father'
• Cell division


  1. Growth & DNA Replication

  2. Mitosis
• Cell cycle


  The cycle when the cell divides is called mitosis
• Mitosis


  • Produces identical cells
  • There is another type of cell division which doesn't produce identical cells (see page 88)
• Cell cycle before mitosis

  1. DNA is spread out in long strings

  2. Cell grows and increases subcellular structures

  3. DNA is duplicated and forms X-shaped chromosomes

  4. Chromosomes line up at the centre of the cell

  5. Cell fibres pull the chromosomes apart

  6. Membranes form around the sets of chromosomes

  7. Cytoplasm and cell membrane divide
• Mitosis produces two new daughter cells that are identical to the parent cell