In meiosis – I, the inter zonal fibers appear in which stage :-

Options

A. Prophase -I
B. Metaphase -I
C. Anaphase - I
D. Telophase -I

Answer

To determine in which stage of meiosis I the interzonal fibers appear, we can analyze the stages of meiosis I step by step.

### Step-by-Step Solution:

1. **Understanding Meiosis I**: Meiosis I consists of several stages: Prophase I, Metaphase I, Anaphase I, and Telophase I. Each stage has specific events and characteristics.

2. **Prophase I**: In this stage, the chromosomes condense, and homologous chromosomes pair up to form tetrads. However, interzonal fibers do not appear in this stage.

3. **Metaphase I**: During this stage, the homologous chromosomes align at the metaphase plate. It is here that the interzonal fibers, which are protein fibers, form between the centromeres of the homologous chromosomes. This is the key stage where interzonal fibers are prominent.

4. **Anaphase I**: In this stage, the homologous chromosomes begin to separate and move towards opposite poles of the cell. The interzonal fibers are not a focus in this stage as the chromosomes are in motion.

5. **Telophase I**: This stage involves the reformation of the nuclear membrane around the separated chromosomes. The interzonal fibers are not present as the cell prepares to divide.

6. **Conclusion**: Based on the analysis, the interzonal fibers appear during **Metaphase I** of meiosis I.

### Final Answer:
The interzonal fibers appear in **Metaphase I** of meiosis I.

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