Final answer:
The passage of the meta-/anaphase checkpoint entails the separation of sister chromatids after alignment at the metaphase plate.
Step-by-step explanation:
The passage of the meta-/anaphase checkpoint entails the separation of sister chromatids. This occurs after the sister chromatids align at the metaphase plate. At the checkpoint, the kinetochores of each pair of sister chromatids must be firmly attached to spindle fibers arising from opposite poles of the cell.