In the somatic cell cycle.

Options

A. DNA replication takes place in S-phase
B. A short interphase is followed by a long mitotic phase
C. `G_(2)` phase follows mitotic phase
D. In `G_(1)` phase DNA content is double the amount of DNA present in the original cell

Answer

**Step-by-Step Solution:**

1. **Understanding the Somatic Cell Cycle:**
- The somatic cell cycle refers to the series of events that a somatic (non-reproductive) cell goes through to divide and produce two daughter cells. This process primarily involves mitosis.

2. **Phases of the Cell Cycle:**
- The somatic cell cycle consists of several phases:
- **G1 Phase (Gap 1):** The cell grows and prepares for DNA replication. It is characterized by normal cellular functions and growth.
- **S Phase (Synthesis):** DNA replication occurs during this phase, resulting in the duplication of the genetic material.
- **G2 Phase (Gap 2):** The cell continues to grow and prepares for mitosis. It checks for DNA damage and ensures that all DNA has been replicated correctly.
- **M Phase (Mitosis):** The cell divides into two daughter cells. This phase is relatively short compared to the interphase (G1, S, and G2).

3. **Key Points about Each Phase:**
- In the **G1 Phase**, the DNA content is the same as the original cell.
- In the **S Phase**, the DNA content doubles as the DNA is replicated.
- In the **G2 Phase**, the cell has double the amount of DNA compared to the original cell.
- The **M Phase** is where the actual division occurs, resulting in two daughter cells.

4. **Interphase vs. M Phase:**
- Interphase (G1, S, G2) is the longer phase of the cell cycle, while M Phase is the shorter phase where mitosis occurs.

5. **Conclusion:**
- The correct statement regarding the somatic cell cycle is that DNA replication takes place in the S phase. The other statements regarding the DNA content in G1 and G2 phases and the duration of interphase compared to M phase are incorrect.