Which is the shortest phase in the cell cycle?

Options

A. `G_1`
B. `G_2`
C. `S`
D. M Phase

Explanation

To determine which is the shortest phase in the cell cycle, we need to analyze the different phases involved. Here’s a step-by-step breakdown:

### Step 1: Understand the Cell Cycle
The cell cycle consists of two main phases: interphase and the M phase (mitosis or meiosis).

**Hint:** Remember that the cell cycle is divided into two primary parts: interphase and the M phase.

### Step 2: Identify the Phases of Interphase
Interphase is further divided into three sub-phases:
- G1 phase (Gap 1)
- S phase (Synthesis)
- G2 phase (Gap 2)

**Hint:** Interphase has three distinct parts where the cell prepares for division.

### Step 3: Analyze the M Phase
The M phase is the phase where actual cell division occurs. This phase includes mitosis (or meiosis) and is responsible for the separation of the cell's genetic material.

**Hint:** The M phase is crucial for cell division and is relatively short compared to interphase.

### Step 4: Compare the Duration of Each Phase
Interphase (G1, S, G2) takes up about 95% of the cell cycle, while the M phase occupies only about 5% of the total time.

**Hint:** Think about the percentage of time each phase occupies in the cell cycle.

### Step 5: Conclusion
Since the M phase is the only phase that represents a small fraction of the cell cycle (approximately 5%), it is the shortest phase in the cell cycle.

**Final Answer:** The shortest phase in the cell cycle is the M phase.