If the DNA content of a cell is 2C after M phase, what will be the DNA content of the cells at `G_(1),` after S and at `G_(2)`

Options

A. 4C, 4C, SC
B. 2C, 2C, 4C
C. 2C, 4C, 8C
D. 2C, 4C, 4C

Answer

To solve the question regarding the DNA content of a cell at different phases of the cell cycle, we will analyze the information provided step by step.

### Step-by-Step Solution:

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

2. **DNA Content After M Phase:**
The question states that the DNA content of the cell is 2C after M phase. This means that the cell has completed mitosis and is now at the end of the M phase, where it has two complete sets of chromosomes.

3. **DNA Content in G1 Phase:**
After the M phase, the cell enters the G1 phase. During G1, the cell is preparing for DNA synthesis but has not yet replicated its DNA. Therefore, the DNA content in the G1 phase remains at **2C**.

4. **DNA Content After S Phase:**
The S phase is where DNA replication occurs. During this phase, the DNA content doubles as each chromosome is replicated. Since the DNA content was 2C at the end of G1, after the S phase, the DNA content will be **4C**.

5. **DNA Content in G2 Phase:**
After the S phase, the cell enters the G2 phase. The DNA content remains the same as it was after the S phase because no further replication occurs in G2. Therefore, the DNA content in G2 is also **4C**.

### Summary of DNA Content:
- After M phase: **2C**
- After G1 phase: **2C**
- After S phase: **4C**
- After G2 phase: **4C**

### Final Answer:
The DNA content of the cells will be:
- G1: **2C**
- S: **4C**
- G2: **4C**

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