Interzonal fibers occur in:-

Options

A. Prophase
B. Early metaphase
C. Late prophase
D. Anaphase

Answer

**Step-by-Step Text Solution:**

1. **Understanding Interzonal Fibers**: Interzonal fibers are also known as protein fibers. They play a crucial role during cell division, particularly in the arrangement and separation of chromosomes.

2. **Analyzing the Options**:
- **Option 1: Prophase**: In prophase, the chromatin condenses into visible chromosomes, and the nuclear membrane begins to break down. Interzonal fibers are not present during this phase.
- **Option 2: Early Metaphase**: During metaphase, chromosomes align at the metaphase plate, and interzonal fibers form between the centromeres of homologous chromosomes. This is the correct phase where interzonal fibers are present.
- **Option 3: Late Prophase**: In late prophase, the nuclear membrane disappears, and chromosomes are fully condensed. Interzonal fibers are not formed yet in this phase.
- **Option 4: Anaphase**: In anaphase, the chromatids are pulled apart towards opposite poles of the cell. Interzonal fibers are not present during this phase as the focus is on the movement of chromatids.

3. **Conclusion**: Based on the analysis, the correct answer is **Option 2: Early Metaphase**, as this is the phase where interzonal fibers are actively involved in the separation of chromosomes.

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