Spindle fibres attach on to

Options

A. Telomere of the chromosome
B. Kinetochore of the chromosome
C. Centromere of the chromosome
D. Kinetosome of the chromosome

Answer

### Step-by-Step Solution:

1. **Understanding Spindle Fibres**: Spindle fibres are structures that form during cell division (mitosis) and are crucial for the separation of chromosomes.

2. **Identifying the Phase**: Spindle fibres begin to form during the prophase stage of mitosis. This is when the chromosomes condense and become visible.

3. **Role of Kinetochore**: The kinetochore is a protein structure that forms on the centromere of each chromosome. It serves as the attachment point for spindle fibres.

4. **Attachment of Spindle Fibres**: During prophase, spindle fibres attach to the kinetochores on the chromosomes. Each chromosome has two kinetochores, one on each sister chromatid.

5. **Function of Spindle Fibres**: The spindle fibres pull the chromosomes apart, aligning them at the metaphase plate during metaphase and ensuring that each daughter cell receives an equal set of chromosomes.

6. **Conclusion**: Based on the understanding that spindle fibres attach to the kinetochores during cell division, the correct answer to the question is **B. Kinetochore of the chromosome**.