where the chromosomes are moving towards the poles of the cell
- Now, during anaphase, the two sister chromatids of each chromosome are pulled apart by the spindle and dragged by their kinetochores toward opposite poles of the cell (i.e., toward the opposite centrosomes). The movement results from a shortening of the spindle microtubules. Each chromosome is pulled along by its centromere. Formally, this phase begins when the duplicated centromeres of each pair of sister chromatids separates, and the resulting daughter chromosomes begin moving toward the poles.