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| Description: The normal cell cycle and each of its growth phases, demonstrating the checkpoints where DNA is monitored for correctness and the G0 phase where the cell rests from replication yet continues to perform its metabolic functions. In synthesis D N A is replicated. There is a cell cycle checkpoint at the beginning of this stage and about 80% of the way through it. Then, in gap 2, the cell prepares for mitosis. There is a cell cycle checkpoint about halfway through this stage, followed immediately by a D N A replication checkpoint. At the end of the stage is an antephase checkpoint. Next comes mitosis. In the metaphase of mitosis, the cell starts to divide with sister chromatids and the mitotic spindle splitting apart. In telophase, the cells are almost fully divided, each with its own chromatid. There is a spindle assembly checkpoint about a third of the way through mitosis. Next comes gap 1, in which there is cell growth. It ends at gap 0 and the starts over. Picture Stats: Views: 98 Filesize: 214.09kB Height: 1386 Width: 1468 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49847 |