Movement of chromosomes during anaphase

Options

A. is independent of spindle fibres
B. depends on spindle fibres and kine-to-chore
C. is due to cytoplasmic streaming
D. is interaction of chromosomes over spindle

Answer

### Step-by-Step Solution:

1. **Understanding Anaphase**: Anaphase is a stage in cell division (mitosis) where sister chromatids are separated and moved towards opposite poles of the cell.

2. **Role of Spindle Fibers**: During anaphase, spindle fibers play a crucial role. They are structures made of microtubules that help in the movement of chromosomes.

3. **Kinetochore Function**: Each chromosome has a region called the kinetochore, which is a protein complex that forms on the centromere. The spindle fibers attach to the kinetochores.

4. **Types of Movements**:
- **Kinetochore Microtubule Shortening**: The microtubules attached to the kinetochores shorten, pulling the sister chromatids apart towards the poles.
- **Non-Kinetochore Microtubule Interaction**: Other spindle fibers (non-kinetochore) push against each other, helping to elongate the cell and separate the poles.

5. **Conclusion**: The movement of chromosomes during anaphase is dependent on the action of spindle fibers and the attachment to the kinetochores. Therefore, the correct answer to the question is that the movement of chromosomes during anaphase depends on spindle fibers and kinetochore.

### Final Answer:
The movement of chromosomes during anaphase depends on spindle fibers and kinetochore.

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