Final answer:
Chromatids separate into chromosomes and migrate to opposite poles during anaphase, not during telophase, which is when chromosomes decondense and nuclear envelopes form around them.
Step-by-step explanation:
Chromatids divide into identical chromosomes and migrate to opposite ends of the cell during the anaphase of mitosis. This phase of mitosis, described in biology textbooks, features the separation of sister chromatids, facilitated by the mitotic spindle. This process is integral to the division of a cell into two identical daughter cells. Figure 7.3.6 indicates that anaphase is the stage where sister chromatids are pulled apart by spindle fibers and named chromosomes as they move to opposite poles.
The next phase, telophase, is characterized by the chromosomes reaching the opposing poles and starting to decondense into a stretched-out chromatin configuration. Nuclear envelopes form around each set of chromosomes, wrapping up the division of the cell's nucleus. Subsequently, cytokinesis occurs, dividing the cytoplasm and completing the process of cell division, resulting in the formation of two identical daughter cells.