The cell cycle

• 1. cell cycle starts when a cell has been made by cell division and ends with the cell dividing to make 2 identical cells
• 2. cell cycle consists of a period of cell growth, DNA Replication, called interphase and a period of cell division called M phase. M phase involves mitosis, and cytokinesis
• 3) interphase - is subdivided int 3 growth stages. G1, S, and G2
• 4) cell cycle regulated by checkpoints. they occur at key point during the cycle to make sure its OK for the process to continue
• M-phase - cytokinesis and mitosis
• Gap phase 1 - cell grows and new organelles and proteins are made
• G2 Checkpoint - the cell checks that the chemicals needed for replication are present and for any damage to the DNA before entering S-phase
• SYNTHESIS - cell replicates its DNA ready to divide by mitosis
• Gap phase 2 - cell keeps growing and proteins needed for cell division are made
• G2 checkpoint - the cell checks whether all the DNA has been replicated without any damage. if it has the cell can enter mitosis