. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANAPHASE MOVEMENT OF CHROMOSOMES 97 TABLE I Effect of temperature on the rate of-chromosome movement (chromosomal fibers only), and on the rate of spindle elongation. Micro,/minute Temperature 17° C. 23° 30° Maximum velocity chromosomes Maximum rate spindle elongation Exposure to low temperature (l°-5° C.) destroys the mitotic spindle, as has been known since the experiments of O. Hertwig (1890) on sea urchins. If grass- hopper spermatocytes at metaphase are exposed to 1° C., the spindle disappears, t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANAPHASE MOVEMENT OF CHROMOSOMES 97 TABLE I Effect of temperature on the rate of-chromosome movement (chromosomal fibers only), and on the rate of spindle elongation. Micro,/minute Temperature 17° C. 23° 30° Maximum velocity chromosomes Maximum rate spindle elongation Exposure to low temperature (l°-5° C.) destroys the mitotic spindle, as has been known since the experiments of O. Hertwig (1890) on sea urchins. If grass- hopper spermatocytes at metaphase are exposed to 1° C., the spindle disappears, the chondriosomes become arranged at random, and the chromosomes are dispersed through the former spindle area. The cells can remain in this state for hours. If they are again exposed to a higher temperature (30° C.) the spindle forms anew, the chondriosomes are lined up on its surface and the chromosomes arranged in the metaphase plate. This process can be repeated several times on the same cells. \ Abnormal spindle elongation The increase in volume during anaphase is a characteristic property of the spindle in most animal cells. This swelling manifests itself especially in a pro- nounced elongation which contributes to the anaphase separation of the chromosomes that are attached to it by means of chromosomal fibers. As was shown above,. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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