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Select the correct even from below that ...

Select the correct even from below that is most likely to occur during the three subphases of the interphase of the mitotic cell cycle .

A

During `G_1` phase , the cell is metabolically active and replicates its DNA .

B

During S phase duplication of centrioles takes place.

C

The number of chromosomes becomes double in the synthesis phase .

D

Replication of DNA starts during the `G_2` phase and proteins are synthesized in order to prepare the cell for mitosis.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the events that occur during the three subphases of interphase in the mitotic cell cycle, we will analyze each option provided and determine which one is correct. ### Step-by-Step Solution: 1. **Understanding Interphase**: Interphase consists of three subphases: G1 (Gap 1), S (Synthesis), and G2 (Gap 2). Each of these phases has distinct activities. 2. **Analyzing Option A**: - **Statement**: "In the G1 phase, the cell is metabolically active and replicates its DNA." - **Evaluation**: This statement is incorrect because DNA replication does not occur during the G1 phase; it occurs during the S phase. Therefore, Option A is false. 3. **Analyzing Option B**: - **Statement**: "During the S phase, there is a duplication of centrioles." - **Evaluation**: This statement is correct. The S phase is indeed when DNA is replicated, and centrioles are also duplicated in preparation for cell division. Thus, Option B is true. 4. **Analyzing Option C**: - **Statement**: "The number of chromosomes becomes double in the synthetic phase." - **Evaluation**: This statement is misleading. While the DNA is replicated in the S phase, the actual doubling of chromosome count is not recognized until the mitotic phase. Therefore, Option C is false. 5. **Analyzing Option D**: - **Statement**: "Replication of DNA starts during the G2 phase and proteins are synthesized in order to prepare for the synthesis of the cell cycle." - **Evaluation**: This statement is incorrect. DNA replication occurs during the S phase, not the G2 phase. While protein synthesis does occur in G2, the replication of DNA does not start here. Therefore, Option D is false. 6. **Conclusion**: After evaluating all options, the only correct statement is Option B: "During S phase, duplication of centrioles takes place." ### Final Answer: **Option B**: During S phase, duplication of centrioles takes place. ---
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