PHS 4300 Lecture Notes - Lecture 10: Lean Body Mass, Progesterone Receptor, Recurrent Laryngeal Nerve
22 Jan 2018
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The cell cycle is a sequence of growth stages that a cell moves through for mitosis and regeneration. In order for cells to undergo mitosis, the cell must go through stages g1, s, g2 and m. Cells that stop dividing are in g0. Stage g0 the cell is at rest and is not actively engaged in the cell cycle. Stage g1 cells enter the cell cycle and prepare for deoxyribonucleic acid (dna) replication. Proto-oncogenes, genes that control cell replication, are activated. Stage s dna replication takes place. Stage g2 synthesis of structures occurs and the structures move to opposite poles in preparation for division into two separate cells. The 46 chromosomes reorganize as two separate sets of 23 chromosome pairs arranged at opposite poles. Two nuclear membranes develop around the two separate sets of 23 pairs: second sub-phase in the interphase in the cell cycle directly preceding mitosis. It follows the successful completion of s phase, during whi(cid:272)h the (cid:272)ells(cid:859)
