In 'S' phase of the cell cycle

Options

A. Amount of DNA is reduced to half in each cell
B. Amount of DNA doubles in each cell
C. Amount of DNA remains same in each cell
D. Chromosome number is increased

Answer

### Step-by-Step Text Solution

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

2. **Identifying the S Phase**: The S phase, or Synthesis phase, is the part of the cell cycle where DNA replication occurs. This phase is crucial for preparing the cell for division.

3. **DNA Replication**: During the S phase, each chromosome is replicated. This means that the amount of DNA in the cell doubles because each chromosome is copied to ensure that both daughter cells will receive an identical set of genetic material.

4. **Consequences of DNA Replication**: As a result of DNA replication, the amount of DNA in each cell increases. However, the number of chromosomes remains the same until the cell undergoes mitosis (M phase).

5. **Conclusion**: Therefore, the correct answer to the question is that the amount of DNA doubles in each cell during the S phase of the cell cycle.

### Final Answer
The amount of DNA doubles in each cell during the S phase of the cell cycle.

---