Mitosis

• Chromosomes


  Contain genetic information
• Chromosomes


  • Made up of DNA molecules
  • Each chromosome contains a large number of genes that control the development of different characteristics
• Body cells have two copies of each chromosome - one from the organism's mother, and one from the father
• Humans have 23 pairs of chromosomes
• Cell cycle


  Series of stages that allows cells to divide and produce new cells for growth, development and repair
• Mitosis


  The stage of the cell cycle when the cell divides
• Cell cycle


  1. Growth & DNA replication

  2. Mitosis
• Growth & DNA replication

  1. DNA is spread out in long strings

  2. Cell grows and increases subcellular structures

  3. DNA is duplicated and forms X-shaped chromosomes
• Mitosis


  1. Chromosomes line up at the centre of the cell

  2. Chromosomes are pulled apart and the two arms go to opposite ends

  3. Membranes form around the sets of chromosomes to become the nuclei of the two new cells

  4. Cytoplasm and cell membrane divide
• The daughter cells contain exactly the same DNA as the parent cell
• 11 cells are undergoing mitosis and 62 cells are not