Answer:
Metaphase
Step-by-step explanation:
- During metaphase, parts of the spindle extend and the chromosomes align at the middle part of the cell.
- During prophase, they condense by winding tightly.
- During anaphase, the copies of the chromosomes separate and start moving towards opposite ends of the cell.
- During cytokinesis or cell division, the cell forms two cells, each containing one of the newly-formed nuclei.
-Therefore, metaphase is the phase of mitosis when chromosomes line up in the middle of the cell.