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Onion cell mitosis. Light micrograph of the cells in the tip of the root of an onion (Allium cepa), two of which are dividing by mitosis. The onion's nuclei and genetic material are stained red. During the first stage of mitosis, prophase, seen in the two cells at centre, the chromosomes condense and become visible. The chromosomes will then align across the middle of the cell during metaphase, before being separated during anaphase and telophase. Two genetically identical daughter cells are formed in mitosis. Magnification: x740 at 6x9cm size. (KEYSTONE/SCIENCE PHOTO LIBRARY/J. L. CARSON, CUSTOM MEDICAL STOCK PHOTO/ SCIENCE PHOTO LIBRARY)