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e.g., After a first division (takes ~90 min) in Xenopus egg, the next 11 divisions occur synchronously (~30 min intervals), producing ~4096 (212)

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Presentation on theme: "e.g., After a first division (takes ~90 min) in Xenopus egg, the next 11 divisions occur synchronously (~30 min intervals), producing ~4096 (212)"— Presentation transcript:

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4 e.g., After a first division (takes ~90 min) in Xenopus egg, the next 11 divisions occur synchronously (~30 min intervals), producing ~4096 (212) cells within 7 hr Each cycle is divided into S and M phases, without detectable G1 and G2 phases

5 The Cell Cycle cell cycle control system, which is similar to a clock Figure Control system G 2 checkpoint M checkpoint G 1 checkpoint G1G1 S G2G2 M

6 Memiliki check point yang spesifik cell cycle akan berhenti sampai ada sinyal untuk lanjut G 1 checkpoint G1G1 G1G1 G0G0 (a) If a cell receives a go-ahead signal at the G 1 checkpoint, the cell continues on in the cell cycle. (b) If a cell does not receive a go-ahead signal at the G 1 checkpoint, the cell exits the cell cycle and goes into G 0, a nondividing state. Figure A, B

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8 SIKLUS SEL Made Pharmawati

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12 Cyclin levels and MPF activity

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14 How G1-cyclin controls entry into S-phase

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