Cynthia observed a cell with a pair of sister chromatids moving toward a given pole as a single unit and another cell with sister chromatids moving to opposite poles. What did she infer from her observation? The first cell is in anaphase I, and the second cell in anaphase II. The first cell is in metaphase II, and the second cell in metaphase I. The first cell is in anaphase II, and the second cell in anaphase I.