Postmitotic gap phase and synthetic phase refer to

Options

A. `G_(2) and S`
B. `G_(1) and S`
C. `G_(1) and G_(2)`
D. `S and G_(2)`

Answer

To answer the question regarding what the postmitotic gap phase and synthetic phase refer to, we will analyze the cell cycle, specifically focusing on the phases involved.

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle is divided into several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each phase has distinct functions that contribute to cell growth and division.

2. **Identifying the Postmitotic Gap Phase**: The term "postmitotic gap phase" refers to the phase that occurs immediately after mitosis (M phase). This is the G1 phase, where the cell grows and prepares for DNA replication.

3. **Identifying the Synthetic Phase**: The "synthetic phase" is specifically the S phase, where DNA replication occurs. During this phase, the cell synthesizes a complete set of DNA for the daughter cells.

4. **Combining the Information**: Since the postmitotic gap phase is G1 and the synthetic phase is S, we can conclude that these two phases refer to G1 and S.

5. **Final Answer**: Therefore, the correct answer to the question is G1 and S.