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Introducing the Cell Cycle. The eukaryotic cell cycle is divided into four phases, designated G 1, S, G 2, and M respectively (see the figure to the right). Collectively, the G 1, S, and G 2 phases are referred to as interphase (designated I in the figure), and take up approximately 90% of the cell's lifespan.ntroducing the Cell Cycle. The eukaryotic cell cycle is divided into four phases, designated G 1, S, G 2, and M respectively (see the figure to the right). Collectively, the G 1, S, and G 2 phases are referred to as interphase (designated I in the figure), and take up approximately 90% of the cell's lifespan.
SUMMARY. 1  The eukaryotic cell cycle is divided into four phases: M (mitosis), G1 (the period between mitosis and the initiation of nuclear DNA replication), S (the period of nuclear DNA replication), and G2 (the period between the completion of nuclear DNA replication and mitosis) (see Figure 13-1).