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| Description: The relative length of the intervals differs among cells. 1 A cell spends most of its life in interphase, which includes three stages: G1, S, and G2. 2 G1 is the interval of growth before DNA replication. The cell’s chromosomes are unduplicated. 3 S is the time of synthesis, during which the cell copies its DNA. 4 G2 is the interval after DNA replication and before mitosis. The cell prepares to divide during this stage. 5 The nucleus divides during mitosis, the four stages of which are detailed in the next section. After mitosis, the cytoplasm may divide. The cycle begins anew, in interphase, for each descendant cell. 6 Built-in checkpoints stop the cycle from proceeding until certain conditions are met. Picture Stats: Views: 108 Filesize: 643.86kB Height: 863 Width: 2169 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48914 |