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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.
During the S phase the cell replicates the chromosomes by taking one chromatid and effectively doubling it (these are later ripped apart during Anaphase in Mitosis). So during the S phase of the Interphase cycle, chromosomes are replicated into two sister chromatids. Normally after this phase there is a check off to make sure nothing went wrong with the replication however should there be any mutations that will create some new DNA form this is where it would be made.