Final answer:
Chromosomes arrive at the poles and transform into indistinct chromatin during telophase, the final stage of mitosis.
Step-by-step explanation:
During telophase, the final phase of mitosis, chromosomes that have been separated arrive at the poles of the cell. It is at this point that the chromosomes begin to decondense into less coiled chromatin. The nuclear envelopes reform around each set of chromatids, making them distinct nuclei.
This transition from distinct chromosomes to a state where the chromatin is indistinct is a key characteristic of this phase, marking the end of nuclear division before the cell divides into two during cytokinesis.