Medical
Biology
Interphase
Question
A biologist examines a series of cells and counts 160 cells in interphase, 20 cells in prophase, 6 cells in prometaphase, 2 cells in metaphase, 7 cells in anaphase, and 5 cells in telophase. If the complete cell cycle requires 24 hours, what is the average duration of M phase in these cells ?
| Stage | Number of cells | Proportion of cells | Average duration |
| counted | at each stage | (hours) | |
| Interphase | 160 | 0.80 | 9.2 |
| Prophase | 20 | 0.10 | 2.4 |
| Prometaphase | 6 | 0.03 | 0.72 |
| Metaphase | 2 | 0.01 | 0.24 |
| Anaphase | 7 | 0.035 | 0.84 |
| Telophase | 5 | 0.0025 | 0.6 |
| Totals | 200 | 1.0 | 24 |
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Solution
Mitosis consists of 4 phases such as prophase, metaphase, anaphase, and telophase and the phase between 2 mitosis is called as interphase
now as per the questions are given details, on the addition of average duration of all phases of mitosis
2.4+0. 72+0. 24+0. 84+0.6 = 4.8 hr
Thus, the correct answer is option C.
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