What cell structure undergoes the greatest changes in the process of division?

So, the structure that undergoes the greatest changes in the fission process is the nucleus. The nucleus is the most important structure in the cell, which performs functions such as storing, implementing and transmitting hereditary information. It consists of chromatin, karyoplasm (nuclear juice), karyolemma (membrane) and nucleoli. It is precisely the same chromatin that undergoes significant changes through spiralization and despiralization of its shape at different stages of division (heterochromatin is a spiralized form, euchromatin is a despiralized form). It should also be noted that the disappearance of the nucleoli and their appearance, cytokinesis (division of the cytoplasm) and other important processes occur.

It should be said about one more structure that is undergoing changes – the cell center, which consists of two centrioles. But compared to the core, this structure undergoes insignificant metamorphosis.