2.2 cell division/binary fission

• G0 phase - resting stage where cell is not actively growing or dividing
• cell cycle - series of events that occur between one mitosis to the next
• Cell division happens because

  • growth
  • repair
  • reproduction
• binary fission

  1. replication of circular DNA and there is an increase in cell size
• 2- 2 circular chronometer migrate to the ends of the cell
• 3- the cell membrane pinches in 2 and a new cell wall formed and eventually breaks off to from 2 cells
• g1:cytosol amounts increase and proteins synthesis mitochondria and chloroplasts divide
• s stage: parent cell replicates its dna and by the end, there will be 2 identical copies of the dna.
• g2 spindles form and the cell grows to twice its size
• p- chromosomes condense and become double stranded. The nuclear envelope also breaks down.

  m- the chromosomes move to the middle of the cell and spindle fibres attach to them.

  a-the chromatids get pulled apart at opposite ends of the cell

  t- a membrane froms and the chromosomes de-condense
• cytokinesis is where new membranes are formed and break apart into 2 cells.
• plant cells have cytokinesis where a cell plate extends to the the sides of the cell to complete the separation