. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. Fig. 123.—^Formation and separation of chromosomes in the spofe grandmother ceils of Osmunda cinnamomea. A, a, early prot^hase showing approximation of nuclear thread in parallel strands; &, detail more highly magnified; B, later prophase showing transverse division of double thread, forming pairs of chromosomes; d, two pairs of chromosomes from c more highly magnified; f, e, metaphase showing separation of the members of the chromosome pairs;/, late anaphase s
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. Fig. 123.—^Formation and separation of chromosomes in the spofe grandmother ceils of Osmunda cinnamomea. A, a, early prot^hase showing approximation of nuclear thread in parallel strands; &, detail more highly magnified; B, later prophase showing transverse division of double thread, forming pairs of chromosomes; d, two pairs of chromosomes from c more highly magnified; f, e, metaphase showing separation of the members of the chromosome pairs;/, late anaphase showing that each chromosome is longitudinally split. Further description in the text. (After Yamanouchi.) through the middle (Fig. 123, C,/), and that the halves spread apart at their equatorial ends while remaining together at their polar ends. At the poles these longitudinally-split chromosomes branch out more or less into a reticulum and a nuclear membrane is formed; but soon the second division is begun, the split chromo- somes become again recognizable, and give evidence by this fact that they had preserved their identity through the resting period. The nuclear membrane now disappears, the chromo- somes become lined up at the equator, and strands of cytoplasm pressing in from opposite poles become attached to the longit- udinal halves and draw them one to one pole and one to the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, William Chase, 1861-. Philadelphia, P. Blakiston's Son
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantanatomy, bookyea
