22.4 MB (1.7 MB compressed)
3370 x 2319 pixels
28.4 x 19.6 cm ⏐ 11.2 x 7.7 in (300dpi)
KAGE MIKROFOTOGRAFIE GBR / SCIENCE PHOTO LIBRARY KAGE MIKROFOTOGRAFIE GBR / SCIENCE PHOTO LIBRARY
Light micrograph of stages of mitosis (cell division) in cells from an onion, Allum sp. The nucleus divides in four stages; prophase, metaphase, anaphase & telophase. Prior to mitosis each chromosome (dark-red stain) makes a copy of itself. At the start of mitosis the original and copy separate from each other & migrate to opposite poles along a spindle apparatus. The chromosomal complement is thus divided into identical copies forming two daughter nuclei. Cytokinesis (division of the cytoplasm & growth of a cell wall) may follow forming separate cells. In some cases the nucleus divides without building a cell wall forming a multinucleate cell.
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