These regions of growth are good for studying the cell cycle because at any given time, you can find cells that are undergoing mitosis. In order to examine cells in the tip of an onion root, a thin slice of the root is placed onto a microscope slide and stained so the chromosomes will be visible.
(J) Drawing from Schrader's book depicting conspicuous chromosomal (kinetochore) fibers during early anaphase inLilium. Until the late 1940s, research on mitosis was primarily restricted to an examination of cells that had been preserved in a lifelike state by chemicals (i.e., fixed) and then colored with dyes to generate contrast between their ...
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