The Question is from neet-botany cell-cycle-and-cell-division , and it was created by the author B VENKAT

Question

Centrioles undergo duplication during (i) of (ii), and begin to move towards opposite poles of the cell during (iii) stage of (iv)

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Cell Cycle and Mitosis
	**Related Topics**: Interphase, Prophase, Centrioles, DNA Replication
	**Prerequisites**: Basic understanding of the cell cycle and the stages of mitosis.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the timing of centriole duplication and movement within the cell cycle.
	We need to identify the correct stages for both events.
**Method & Steps**:
	1. **Centriole Duplication:** Centrioles duplicate during the S phase of interphase. This is because DNA replication also occurs during S phase and centriole duplication is closely related to preparing the cell for division.
		Reasoning: S phase is where DNA and other cellular components are replicated for division
	2.  **Centriole Movement:** Centrioles begin to move to opposite poles during prophase of mitosis. This is the stage where the mitotic spindle is forming.
		Reasoning: Movement to poles occurs with the formation of the spindle fibers
	3. **Overall Context:** Both events are part of the overall process of cell division (mitosis) and preparation for it (interphase).
		Result: The combination of these steps leads to the correct answer choice
## OPTION ANALYSIS
[A] ✓: This option correctly identifies S phase of interphase as the time of centriole duplication, and prophase of mitosis as the time of centriole movement toward opposite poles.
[B] :x: This option correctly identifies S phase and interphase for duplication but incorrectly identifies anaphase for the movement of centrioles, which happens during prophase.
[C] :x: This option incorrectly identifies prophase for duplication. Duplication occurs in S phase of interphase. It also incorrectly identifies metaphase for the movement of centrioles, which happens during prophase.
[D] :x: This option incorrectly identifies prophase for duplication. Duplication occurs in S phase of interphase. It also correctly identifies anaphase for the movement of centrioles, which happens during prophase.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing S phase with other phases of interphase: Remember that DNA and centriole duplication specifically occur in S phase.
		2. Confusing prophase with other mitotic phases: Centrioles begin to move to poles in prophase, not metaphase or anaphase.
	**Quick Tips**:
		1. Think of 'S' phase as 'Synthesis' phase, where DNA and centriole synthesis occurs.
		2. Prophase comes before metaphase, and the centrioles need to move to poles before the chromosomes align in the middle.

B VENKAT · Answer

The correct Option is "i-S phase, ii-inter phase, iii- Prophase, iv-Mitosis"

B VENKAT · Answer

i-S phase, ii-Inter phase, iii-Anaphase, iv- Mitosis

B VENKAT · Answer

i-Prophase, ii-Mitosis, iii-Metaphase, iv- Mitosis

B VENKAT · Answer

i-Prophase, ii-Mitosis, iii-Anaphase, iv-Mitosis

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