Abstract
THE accompanying photographs (Fig. 1) show the kind of results which are being obtained by application of Sax's method1 for spiral structure to the meiotic chromosomes of the Royal Fern (Osmunda regalis). Both photographs represent gemini at the metaphase of the first division of the spore mother cells; Fig. l(a) is a photomicrograph of a pair of chromosomes united by a single sub-terminal chiasma, Fig. 1(b) is a photomicrograph of a pair joined by two chiasmata, one at each end. Both show major spirals of about five coils per chromosome, the two chromatids in each chromosome being in close contact, except at the chiasmata, and occupying the same spiral path.
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MANTON, I. Spiral Structure of Chromosomes in Osmunda. Nature 138, 1058 (1936). https://doi.org/10.1038/1381058a0
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DOI: https://doi.org/10.1038/1381058a0
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