The cell spends most of its lifespan in the Interphase, in which the preparation of cell division takes place. All the materials required for growth is produced during this time and it contains all the time spent between divisions. The interphase can be divided into three sub phases: G1, S and G2 phase. The first subphase is known as G1. This is the growth phase. From G1 phase a cell may exit the cell cycle and go into a long-term stable state known as G₀. The cell is able to function in this state but doesn't split. The second subphase is known as the S phase, this is the synthesis phase- when the DNA duplicates. During this sub-phase chromosomes are replicated so that every chromosome contains two sister chromatids. The final sub-phase of Interphase is G2, the replication of chromosomes is complete by this phase. During this phase rapid growth occurs while the cell prepares for mitosis.
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