During mitosis, the chromatids are moved by the spindle apparatus, which is composed of microtubules. These microtubules originate from structures called centrosomes, which are located at opposite poles of the cell.
As mitosis progresses, the spindle fibers attach to the kinetochores, which are protein complexes that form on the centromere of each chromatid. Once attached, the spindle fibers pull the chromatids apart, ensuring that each daughter cell receives an equal set of chromosomes. This process is crucial for the accurate distribution of genetic material during cell division.
In summary, the movement of chromatids during mitosis is facilitated by the spindle apparatus and its interaction with the kinetochores, ensuring the proper segregation of chromosomes.