A teacher was trying to show the different stages of a type of cell division to the students. At a particular stage , it was observed that the chromosomes were separating but there was no splitting of centromeres. This stage would be

Options

A. metaphase I
B. metaphase II
C. anaphase I
D. anaphase II

Answer

To solve the question, we need to identify the specific stage of cell division where chromosomes are separating but the centromeres are not splitting. Here’s a step-by-step breakdown of the reasoning:

### Step 1: Understand the Stages of Cell Division
Cell division can occur through two main processes: mitosis and meiosis. Each of these processes has distinct stages.

### Step 2: Identify the Relevant Stages
In meiosis, there are two rounds of division: meiosis I and meiosis II. Each of these has several phases:
- **Meiosis I**: Prophase I, Metaphase I, Anaphase I, Telophase I
- **Meiosis II**: Prophase II, Metaphase II, Anaphase II, Telophase II

### Step 3: Analyze the Stages
- **Metaphase I**: Chromosomes line up at the equatorial plane, and centromeres are not splitting.
- **Metaphase II**: Similar to metaphase I, but involves sister chromatids.
- **Anaphase I**: Here, homologous chromosomes are pulled apart towards opposite poles, but the centromeres do not split.
- **Anaphase II**: Centromeres split, and sister chromatids are pulled apart.

### Step 4: Focus on Anaphase I
The key detail in the question is that chromosomes are separating without the centromeres splitting. This description matches **Anaphase I** of meiosis, where homologous chromosomes are separated, but the centromeres remain intact.

### Conclusion
Based on the analysis, the stage where chromosomes are separating without the splitting of centromeres is **Anaphase I**.

### Final Answer
The stage observed is **Anaphase I**.

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