Question

Spindle fibres get attached to the kinetochore of the chromosome during

• A. Metaphase
• B. Anaphase
• C. Telophase
• D. None of these

Answer 1

The correct option is A

Metaphase

The correct option is A

Explanation of the correct option :

1. Spindle fibres arise from the centrioles and help in chromosome movement during cell division.
2. The two sister chromatids of chromosome are held together at a region called centromere.
3. Kinetochore is a disc shaped protein associated with the centromere region of chromosomes.
4. Spindle fibres attach to kinetochore of chromosomes during metaphase.

Explanation of the incorrect option :

Option B:

1. The splitting of the sister chromatids marks the onset of anaphase.
2. These sister chromatids become the chromosome of the daughter nuclei.
3. The chromosomes are then pulled towards the pole by the fibres attached to the kinetochores of each chromosome.

Option C:

1. The chromosomes that cluster at the two poles start coalescing into an undifferentiated mass, as the nuclear envelope starts forming around it.
2. The nucleolus, Golgi bodies and ER complex, which had disappeared after prophase start to reappear.

Final answer: Spindle fibres get attached to the kinetochore of the chromosome during metaphase.