Imagine looking through a microscope at a squashed onion root tip. the chromosomes of many of the cells are plainly visible. in some cells, replicated chromosomes are aligned along the center (equator) of the cell. these particular cells are in which stage of mitosis?

Metaphase.

Explanation:

Metaphase may be defined as the stage of the cell cycle followed after the prophase and before the anaphase. The chromosomes are joined together with the centromere.

This stage can easily be identified in the microscope. The chromosomes are aligned themselves at metaphasal plate in the center of the cell.

Thus, the answer is metaphase.