A researcher observes a dividing cell under a microscope. Chromosomes are seen moving towards opposite poles. Notably, each chromosome moving towards the pole consists of two chromatids joined at a single, undivided centromere. Identify the specific stage and type of cell division being observed.

Step-by-step solution

The movement of chromosomes towards opposite poles indicates that the cell is in the anaphase stage of division. The key observation is that each chromosome consists of two chromatids joined at an undivided centromere. This means the centromere has not split. In anaphase of mitosis and anaphase II of meiosis, the centromeres split and sister chromatids separate to move to opposite poles. However, in Anaphase I of meiosis, homologous chromosomes separate while sister chromatids remain associated at their centromeres