In the process of meiosis, there are two sequential cycles of nuclear and cell division. How many cycles of DNA replication are required in meiosis ?

Options

A. one
B. Four
C. Two
D. No replication process

Answer

To determine how many cycles of DNA replication are required in meiosis, we need to understand the process of meiosis and the role of DNA replication within it.

### Step-by-Step Solution:

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four daughter cells, each with half the number of chromosomes of the original cell. It consists of two sequential divisions: Meiosis I and Meiosis II.

2. **Phases of Meiosis**:
- **Meiosis I**: This is the reductional division where homologous chromosomes are separated.
- **Meiosis II**: This is similar to mitosis, where sister chromatids are separated.

3. **DNA Replication**: DNA replication occurs during the S phase (Synthesis phase) of interphase, which precedes meiosis. This is the only time the DNA is replicated before the two meiotic divisions.

4. **Number of DNA Replication Cycles**:
- Since DNA replication occurs only once during the S phase before meiosis begins, and this single replication leads to the formation of sister chromatids, there is only **one cycle of DNA replication** required for meiosis.

5. **Conclusion**: Therefore, the answer to the question is that only **1 cycle of DNA replication** is required in meiosis.

### Final Answer:
**1 cycle of DNA replication is required in meiosis.**

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