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DNA replication occurs -...

DNA replication occurs -

A

During both mitosis and meiosis

B

Only during mitosis

C

Only during meiosis

D

During the S phase

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Cell Cycle**: The cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each phase has specific functions related to cell growth and division. 2. **Identifying the S Phase**: The S phase is specifically designated for DNA synthesis. During this phase, the DNA is replicated, meaning that each chromosome is duplicated to form two sister chromatids. 3. **Clarifying Chromosome Number**: It is important to note that while DNA replication occurs during the S phase, the actual number of chromosomes does not double at this point. Instead, each chromosome is copied, but they remain connected as sister chromatids until mitosis or meiosis occurs. 4. **Conclusion on DNA Replication Timing**: Given the information, DNA replication occurs specifically during the S phase of the cell cycle. Therefore, the correct answer to the question is that DNA replication occurs during the S phase. 5. **Final Answer**: The answer is during the S phase (Option number 4). ---
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