BIOLOGY- 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- stage 2

  • One set of chromosomes is pulled to each end of the cell
  • The nucleus also divides
• Functions of mitosis

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


  when cells divide
• Mitosis- stage 1

  • DNA replicates to from two copies of of each chromosomes
  • The cell grows and copies it's internal structures .e.g. mitochondria, ribosomes
• Mitosis- stage 3

  • The cytoplasm and cell membrane divide to form two identical cells