The DNA content of a diploid cell in the G phase of the cell cycle is measured. If this DNA content is X, then the DNA content of the same cell at metaphase of meiasis I would be

Options

A. 0.5 X
B. 0.25 X
C. X
D. 2 X

Answer

To determine the DNA content of a diploid cell at metaphase of meiosis I, we need to analyze the cell cycle stages and the changes in DNA content that occur throughout the process.

### Step-by-Step Solution:

1. **Understanding the G Phase DNA Content**:
- In the G phase (specifically G1 phase) of the cell cycle, the DNA content of the diploid cell is measured as **X**.

2. **DNA Replication in the S Phase**:
- During the S phase of the cell cycle, DNA replication occurs. This means that the DNA content doubles.
- Therefore, after the S phase, the DNA content becomes **2X**.

3. **G2 Phase**:
- After the S phase, the cell enters the G2 phase, where the DNA content remains **2X** since no further replication occurs.

4. **Metaphase of Meiosis I**:
- The cell then progresses to the M phase, specifically metaphase of meiosis I.
- At this stage, the DNA content is still **2X** because the chromosomes are aligned and ready for separation, but they have not yet been separated.

5. **Conclusion**:
- Therefore, the DNA content of the diploid cell at metaphase of meiosis I is **2X**.

### Final Answer:
The DNA content of the same cell at metaphase of meiosis I would be **2X**.

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