In human cell cycle, interphase lasts for about

Options

A. 0.7
B. 0.95
C. 0.8
D. 0.25

Answer

**Step-by-Step Solution:**

1. **Understanding the Cell Cycle**: The cell cycle is a sequence of events that occur during a cell's growth and division. It includes both cell growth and the actual division of the cell.

2. **Phases of the Cell Cycle**: The cell cycle consists of two main phases: Interphase and the Mitotic phase (Mitosis). Interphase is the longest phase of the cell cycle.

3. **Sub-phases of Interphase**: Interphase can be further divided into three sub-phases:
- G1 Phase (Gap 1): Cell growth occurs, and cellular organelles are synthesized.
- S Phase (Synthesis): DNA replication occurs, doubling the amount of genetic material.
- G2 Phase (Gap 2): Further growth and preparation for mitosis.

4. **Duration of the Cell Cycle**: In human cells, the entire cell cycle takes about 24 hours to complete.

5. **Duration of Interphase**: Out of the 24 hours, Interphase lasts approximately 23 hours, while the Mitotic phase takes about 1 hour.

6. **Calculating the Proportion of Interphase**: To express the duration of Interphase as a fraction of the total cell cycle:
- Interphase duration = 23 hours
- Total cell cycle duration = 24 hours
- Fraction of Interphase = 23/24 = 0.9583 (approximately 0.95)

7. **Conclusion**: Therefore, in human cells, Interphase lasts for about 0.95 of the total cell cycle duration. The correct answer is option 2 (0.95).

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