The Phase in which two identical copies of DNA are formed is:
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- \( \text{M phase} \)
- \( \text{G2 phase} \)
- \( \text{G1 phase} \)
- \( \text{S phase} \)
The Correct Option is D
Solution and Explanation
Step 1: Understanding the phases of the cell cycle. The cell cycle consists of the following phases:
1. G1 phase: The cell grows and prepares for DNA replication.
2. S phase: DNA replication occurs, resulting in the formation of two identical copies of DNA.
3. G2 phase: The cell prepares for mitosis by synthesizing necessary proteins and organelles.
4. M phase: The cell undergoes mitosis and cytokinesis, resulting in two daughter cells.
Step 2: Explanation of DNA replication. During the \( S \) phase (synthesis phase), the DNA in the cell is duplicated, ensuring that each daughter cell receives an identical copy during cell division.
Step 3: Comparison with other options. - Option \( (A) \): \( M \) phase is the mitotic phase where cell division occurs, not DNA replication.
- Option \( (B) \): \( G2 \) phase is for cell growth and preparation for mitosis, not DNA synthesis.
- Option \( (C) \): \( G1 \) phase is the initial growth phase before DNA replication.
Conclusion: DNA replication occurs in the \( S \) phase, making \( (D) \) the correct answer.
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