cell division

• describe role of cell cycle

  produce new cells for growth, development and repair
• describe first stage of cell cycle

  1. increase number of subcellular structures
  2. duplicate dna
  3. form x shaped chromosomes
• describe second stage of cell cycle

  1. x shaped chromosomes line up at cell centre
  2. each arm pulled to opposite poles by cell fibres
  3. nucleus divides
• describe third stage of cell cycle

  1. cytoplasm and cell membrane divide
• describe products of cell cycle

  two genetically identical daughter cells
• give cell division of prokaryotic cells

  binary fission
• describe process of binary fission

  1. cell increase in size
  2. duplicate circular dna and plasmids
  3. circular dna move to opposite poles of cells
  4. cytoplasm begin to divide and cell wall start to form around each set
  5. cytoplasm and cell wall divide
• describe products of binary fission

  two genetically different daughter cells
• why are daughter cells of binary fission genetically unique

  one circular dna each and variable number of plasmids