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JIPMER 2015
Exam
JIPMER
Year
2015
Subject
Botany
Chapter
Cell Cycle and Cell Division

JIPMER 2015 · Botany · Cell Cycle and Cell Division

The mitotic cell cycle is divided typically into four phases: G_1,...

The mitotic cell cycle is divided typically into four phases: G1, S,G2\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

Options

  1. AG1 SG2M1359\begin{array}{cccc}\mathrm{G}_1 & \mathrm{~S} & \mathrm{G}_2 & \mathrm{M} \\ 1 & 3 & 5 & 9\end{array}
  2. BG1 SG2M9135\begin{array}{cccc}\mathrm{G}_1 & \mathrm{~S} & \mathrm{G}_2 & \mathrm{M} \\ 9 & 1 & 3 & 5\end{array}
  3. CG1 SG2M9531\begin{array}{cccc}\mathrm{G}_1 & \mathrm{~S} & \mathrm{G}_2 & \mathrm{M} \\ 9 & 5 & 3 & 1\end{array}
  4. DG1 SG2M3591\begin{array}{cccc}\mathrm{G}_1 & \mathrm{~S} & \mathrm{G}_2 & \mathrm{M} \\ 3 & 5 & 9 & 1\end{array}

Correct answer

C. G1 SG2M9531\begin{array}{cccc}\mathrm{G}_1 & \mathrm{~S} & \mathrm{G}_2 & \mathrm{M} \\ 9 & 5 & 3 & 1\end{array}

Step-by-step solution

The longest phase of cell cycle is G1\mathrm{G}_1 where these rapid growth and metabolic activity, followed by S phase for DNA synthesis and replication then G2\mathrm{G}_2 phase for preparation of cell division and lastly mitotic phase. ∴\therefore Ratio is 9:5:3:19: 5: 3: 1
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