Spindle fibres attach on to:
Answer: (B) Kinetochore of the chromosome. Answer: Kinetochore of the chromosome Solution: Spindle fibres attach to the kinetochores, small disc-shaped structures on the surface of the centromere, which serve as the attachment sites that allow chromosomes to be moved to the metaphase plate.
- A.Telomere of the chromosome
- B.Kinetochore of the chromosome✓
- C.Centromere of the chromosome
- D.Kinetosome of the chromosome
Correct Answer
(B) Kinetochore of the chromosome
Solution & Explanation
Answer: Kinetochore of the chromosome Solution: Spindle fibres attach to the kinetochores, small disc-shaped structures on the surface of the centromere, which serve as the attachment sites that allow chromosomes to be moved to the metaphase plate. The centromere (option C) is the constriction that holds sister chromatids and carries the kinetochore, but the fibres physically dock on the kinetochore itself. The telomere is the chromosome end and the kinetosome is a basal-body structure of cilia/flagella, so both are unrelated to spindle attachment. NCERT Reference: Ch 10, p.123, lines 29-30 — "Spindle fibres attach to kinetochores of"