numerical: cell cycle timing

Question

A cell cycle totals 20 hours: G1=9h, S=6h, G2=3h. How long does M phase last?

RankGuru · Accepted Answer

1. **Interphase Components**: The total time spent in interphase is the sum of $G_1, S,$ and $G_2$ phases.
   - $Interphase \ Time = 9 \ hrs (G_1) + 6 \ hrs (S) + 3 \ hrs (G_2) = 18 \ hrs$.
2. **Total Cycle**: The whole cell cycle includes Interphase and the $M$ (Mitotic) phase.
   - $Total \ Time = Interphase + M \ phase$.
3. **Calculation**: 
   - $20 \ hrs = 18 \ hrs + M \ phase$.
   - $M \ phase = 2 \ hrs$.
4. **Conclusion**: The Mitotic phase lasts for **2 hours**.

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numerical: cell cycle timing

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