Biology – Chromosome behaviour in mitosis | e-Consult

(a) The stage of mitosis shown in the diagram is Metaphase.

Explanation: The chromosomes are clearly visible and aligned at the metaphase plate (the middle of the cell). The spindle fibres are attached to the centromeres of the chromosomes, ensuring they are positioned correctly. The nuclear envelope is fragmented, and the centrosomes are located at opposite poles, which is characteristic of metaphase.

(b) The function of the centrosomes during mitosis is to organise and control the formation of the mitotic spindle. The centrosomes duplicate during interphase and migrate to opposite poles of the cell. They then serve as the attachment points for the spindle fibres, which are essential for separating the chromosomes during anaphase.