Final answer:
Metaphase is the stage of mitosis during which chromosomes align at the metaphase plate, preparing for even segregation into daughter cells.
Step-by-step explanation:
The phase of mitosis where chromosomes migrate to the middle of the cell is called metaphase. This stage is known for the alignment of sister chromatids along the metaphase plate, a plane that is equidistant from the two poles of the cell. The microtubules, which are part of the spindle apparatus, attach to the kinetochores of the sister chromatids during this phase. This critical arrangement ensures that, in the subsequent phase of mitosis, each new daughter cell will receive an identical set of chromosomes when the sister chromatids are pulled apart.
During metaphase, chromosomes become maximally condensed, making them more visible under a light microscope. This stage is pivotal for the correct segregation of genetic material. Following metaphase, the process proceeds to anaphase where the sister chromatids are separated and drawn to opposite poles, signifying the next phase of mitosis.