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â Interphase (grey) is the longest phase which itself occurs in three stages. â G1 The cell performs its normal differentiated function. Protein synthesis/ mitochondria replication/ chloroplast replication. â S DNA replication. At this point the mass of DNA in the cell has doubled.
S Phase: To produce two similar daughter cells, the complete DNA instructions in the cell must be duplicated. DNA replication occurs during this S (synthesis) phase. Gap 2 (G2): During the gap between DNA synthesis and mitosis, the cell will continue to grow and produce new proteins. At the end of this gap is another control checkpoint (G2 Checkpoint) to determine if the cell can now proceed to enter M (mitosis) and divide.