Cell Division

• What a chromosome contains

  Many genes
• What is mitosis

  It's for growth repair and replacement of cells
• What are cancer cells

  Arise due to mutations in genes that control mitosis. Leads to uncontrolled cell division and tumours
• Types of tumours

  • Benign
  • Malignant
• Nucleus

  Contains chromosomes
• A human nucleus contains 23 pairs of chromosomes
• Benign tumours

  Unable to spread to other parts of the body and are non-cancerous
• Malignant tumours

  Can invade neighbouring tissues and spread to different parts of the body in the blood where they form secondary tumours.
• What is a chromosome

  Strands of DNA
• Growth and DNA Replication

  1. DNA is spread out
  2. Cell grows and increases subcellular structures
  3. DNA is duplicated
• Mitosis

  1. Chromosomes line up at the centre
  2. Chromosomes are pulled apart
  3. Membranes form around the chromosomes
  4. Cytoplasm and cell membrane divide

  
• The daughter cells formed from mitosis are identical to the parent cell
• The Cell Cycle

  1. Growth and DNA replication
  2. Mitosis
• What is a gene

  A section of DNA