Light micrograph of onion (Allium cepa) root tip cells stained with acetocarmine to show nuclei and chromosomes. The field includes cells in interphase, prophase, metaphase, and late telophase.

This is a region of a (semithin) longitudinal section of onion root taken from the meristematic zone; this is the undifferentiated region of plant tissue from which new cells are formed. Therefore, it...