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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.
cell division is a complex process that requires the temporary dissolution of the nuclear envelope. Eukaryotic organisms carry out mitosis throughout their entire life to grow and to replace old or damaged cells. Some eukaryotic organisms use mitosis to reproduce asexually. The daughter cells produced by mitosis are diploid and genetically identical to each other and the parent cells that produced them. CELL CYCLE = INTERPHASE + MITOSIS Cells only spend a small part of their life dividing. The time between consecutive mitotic