46.3 MB (46.0 MB compressed)
4837 x 3343 pixels
40.9 x 28.2 cm ⏐ 16.1 x 11.1 in (300dpi)
SCIENCE PICTURES LTD / SCIENCE PHOTO LIBRARY SCIENCE PICTURES LTD / SCIENCE PHOTO LIBRARY
Meiosis. Light micrograph of bluebell (Endymion sp.) anther cells in meiosis. Meiosis (at right frame) is a reduction division of the cell nucleus to produce cells with one set of chromosomes. The first stage (Prophase I) is the visible condensing and pairing of chromosomes (upper centre). At the next stage (Metaphase I) the chromosomes attach to a spindle on the cell's midline (most are at this stage). The chromosomes then move to the spindle poles (Anaphase I) seen at bottom centre. The cell then divides and the nuclear membrane reforms (Telophase I). These stages are repeated (Prophase II-Telophase II) to produce 4 haploid cells. Magnification: x100 at 35mm size.
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