The completion of the physical division of the parent cell during the last stage of mitosis is known as cytokinesis.

Here's a breakdown:

* Mitosis: The process of cell division that produces two identical daughter cells.

* Cytokinesis: The division of the cytoplasm and the physical separation of the two daughter cells. This process occurs concurrently with telophase, the final stage of mitosis.

So, while mitosis involves the division of the nucleus, cytokinesis is the final step that splits the entire cell into two separate entities.