Mitosis

• Nucleus


  Contains chromosomes made of DNA molecules which carry a large number of genes
• Chromosomes


  Normally found in pairs in body cells
• Cell cycle

  1. Interphase

  2. Mitosis

  3. Cell division
• Interphase

  • Cell grows
  • Increases number of structures like ribosomes and mitochondria
  • Replicates its DNA to form two copies of each chromosome
• Mitosis


  • One set of chromosomes is pulled to each end of the cell
  • The nucleus divides
• Cell division


  • Cell membranes and cytoplasm divide
  • Two identical cells form
• A cell spends most of its life in Interphase
• The parent cell is a diploid cell, meaning it has two sets of chromosomes
• Before the parent cell divides, each chromosome is copied exactly
• Mitosis


  • Makes two cells
  • Makes cells that are genetically identical to the parent cell
• Diploid


  Double (two sets of chromosomes)
• When the cell divides in two, each cell gets one copy of each chromosome
• Situations where mitosis is used to produce new cells

  • Growth
  • Repair to damaged parts of the body
  • Asexual reproduction
• Daughter cells produced by mitosis are genetically identical to each other and to the parent cell
• Nucleus


  The control centre of the cell
• Mitosis


  The process of cell division
• Cell cycle


  The series of events a cell goes through as it grows and divides
• Cell cycle


  1. Stage 1

  2. Stage 2 (Mitosis)

  3. Stage 3
• Stage 1


  • The longest stage
  • The cell grows
  • Increases the number of sub-cellular structures
• Stage 2 (Mitosis)


  • One set of chromosomes is pulled to each end of the nucleus
  • DNA replicates to form two copies of each chromosome
• Stage 3


  • The cytoplasm and cell membranes divide
  • Two identical cells are formed
• The cell cycle results in two identical cells being formed
• The cell cycle involves three main stages
• Mitosis is the process of cell division
• The nucleus is the control centre of the cell