reviewer 2

• Cell cycle


  An ordered series of events involving cell growth, nuclear division and in most cases cytoplasmic division which results in the formation of daughter cells
• Cell cycle


  • M phase (cell division) is a short part of the cycle
  • Interface is a much longer phase which accounts for about 90% of the cycle
• Interface


  1. G1 phase

  2. S phase

  3. G2 phase
• G1 phase


  The cell is growing bigger in size and accumulating the building blocks of DNA and associated proteins
• S phase


  DNA is replicated resulting in the formation of two identical copies of each chromosome
• G2 phase


  The cell makes sure it has done all the necessary preparations before going through the start of M phase
• M phase (cell division)

  1. Nuclear division (mitosis or meiosis)

  2. Cytoplasmic division (cytokinesis)
• Mitosis


  Nuclear division in somatic cells
• Meiosis


  Nuclear division in cells that form gametes (sex cells)
• Cytokinesis


  Cytoplasmic division, results in the formation of uninucleate cells
• If cytokinesis does not occur with nuclear division, multinucleate cells will form</b>
• Examples of multinucleate cells include skeletal muscle fibers
• Once cells have undergone M phase, the new daughter cells may then begin to undergo another round of cell cycle