The number of chromosomes in ` G_(1)` phase is 36, the number of chromosomes in S phase is

Options

A. 36
B. 18
C. 22
D. 37

Answer

To solve the question regarding the number of chromosomes in the S phase when the number of chromosomes in the G1 phase is given as 36, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Cell Cycle Phases**:
- The cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis).
- In the G1 phase, the cell grows and prepares for DNA replication.

2. **Identifying the Number of Chromosomes in G1 Phase**:
- We are given that the number of chromosomes in the G1 phase is 36. This is the diploid number (2n) for the organism.

3. **Understanding the S Phase**:
- The S phase is where DNA replication occurs. During this phase, each chromosome is duplicated, resulting in two sister chromatids for each chromosome.

4. **Determining the Number of Chromosomes in S Phase**:
- Although the amount of DNA doubles during the S phase (because each chromosome is replicated), the actual number of chromosomes remains the same.
- Therefore, the number of chromosomes in the S phase will still be 36, as the chromosomes have not yet separated into two during mitosis.

5. **Conclusion**:
- The number of chromosomes in the S phase is 36.

### Final Answer:
The number of chromosomes in the S phase is 36.

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