What happens to cyclin levels as the cell passes through the S phase, the G2 phase, and enters mitosis?

S- Cyclin as it passes through the S phase is low in early G1, it the rise slowly through late G1 and S, peaking in early G2 and then dropping sharply back to zero in early Mitosis phase.

Cell often moves to the next stage of the cell cycle. The cyclins that were active in the previous stage are reduced.

Cyclin plays a role of regulating the cell cycle when they are tightly bound to Cdks.

Interphase is made up of G1 phase (cell growth), S phase (DNA synthesis), and G2 phase (cell growth). At its end of interphase comes the mitotic phase,.

It is known to push the events of the cell cycle by partnering with a family of enzymes called the cyclin-dependent kinases (Cdks).

Conclusively,Cyclin levels is not stable during the cell cycle, which is the main regulation by transcriptional activation and proteolytic destruction.

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Answer:

Cyclin levers are relatively low but increases strongly when needed. Going deeper into the topic, we can say that G1 cyclin increases at the beginning of G1 and starts decreasing throughout the whole cycle. The G1/S cyclin level starts increasing from mid G1, reaches its peak at the beginning of S, and decreases again mid S phase. The S cyclin however starts increasing 3/4th its way through G1, reaches its peak mid G2, and decreases completely at the M phase. Finally the M cyclin levels start increasing from the beginning of the S phase, peaks at the very beginning of mitosis, and falls dramatically at mid mitosis.

Explanation: