cell division by mitosis

• Mitosis


  The process by which a cell divides into two or more cells
• Cell


  • Contains a nucleus
  • Contains chromosomes made of DNA
• Body cells contain 23 pairs of chromosomes
• Gamete cells have unpaired chromosomes
• Chromosome


  Carries a large number of genes that determine many features
• Most human chromosomes contain hundreds of genes
• Animals and plants contain a very large number of cells
• Cell cycle including mitosis

  1. DNA replication

  2. Mitosis

  3. Cell division
• Mitosis


  • One set of chromosomes is pulled to each end of the cell
  • The nucleus also divides
  • The cytoplasm and cell membrane divide to form two identical cells
• The AQA exam only requires knowledge of the main stages of mitosis shown in this video
• Functions of mitosis


  • Growth and development of multicellular organisms
  • Repair of organisms
  • Asexual reproduction