M-Phase in humans lasts
(a) 90% of the total cell division duration
(b) 60% of the total cell division duration
(c) 96% of the total cell division duration
(d) 5 % of the total cell division duration

Options

A. 90% of the total cell division duration
B. 60% of the total cell division duration
C. 96% of the total cell division duration
D. lt 5 % of the total cell division duration

Answer

To determine the duration of the M-phase in humans, we need to analyze the cell cycle and the proportion of time spent in each phase.

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of two main phases: Interphase and M-phase (Mitotic phase). Interphase is further divided into three sub-phases: G1, S, and G2.

2. **Duration of Interphase**: In humans, the interphase occupies a significant portion of the cell cycle. It is generally accepted that interphase can take about 24 hours.

3. **Proportion of M-phase**: The M-phase, which includes mitosis and cytokinesis, is much shorter compared to interphase. In fact, it occupies only about 5% of the total duration of the cell cycle.

4. **Calculating the M-phase Duration**: If interphase takes approximately 95% of the cell cycle, then the remaining 5% is the duration of the M-phase.

5. **Conclusion**: Based on the analysis, the M-phase in humans lasts for 5% of the total cell division duration. Therefore, the correct answer is option (d) 5%.

### Final Answer:
(d) 5% of the total cell division duration.