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The mitotic cell cycle is divided typically into four phases: $\mathrm{G}_1, \mathrm{~S}, \mathrm{G}_2$ and M . Considering a mitotic cycle time of 18 hrs ; the distribution of period of time (in hrs) for each of these phases will be
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$\begin{array}{cccc}\mathrm{G}_1 & \mathrm{~S} & \mathrm{G}_2 & \mathrm{M} \\ 9 & 5 & 3 & 1\end{array}$
The longest phase of cell cycle is $\mathrm{G}_1$ where these rapid growth and metabolic activity, followed by S phase for DNA synthesis and replication then $\mathrm{G}_2$ phase for preparation of cell division and lastly mitotic phase.
$\therefore$ Ratio is $9: 5: 3: 1$
$\therefore$ Ratio is $9: 5: 3: 1$
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