. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2OO BARBARA HEFFXER. 36, always counting the two arms of the Y-shaped chromosome as one. Although I did not have very much material I was never- theless able to trace the V-shaped chromosomes in the 2-, 4-, 8-, 12- and 16- to 32-cell stages. • . .. ..•••;" O 0 ~" O rt Q n O °°n°*° o° ° 0 o° °° 0 0 o O o o o o o a 6a 6b 7 FIG. 6. FIG. 7. Fig. 8, a and &, shows a metaphase from a 2-cell stage, with the three V-shaped chromosomes distinguishable by their char- acteristic splitting figures, which are fully explaine
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2OO BARBARA HEFFXER. 36, always counting the two arms of the Y-shaped chromosome as one. Although I did not have very much material I was never- theless able to trace the V-shaped chromosomes in the 2-, 4-, 8-, 12- and 16- to 32-cell stages. • . .. ..•••;" O 0 ~" O rt Q n O °°n°*° o° ° 0 o° °° 0 0 o O o o o o o a 6a 6b 7 FIG. 6. FIG. 7. Fig. 8, a and &, shows a metaphase from a 2-cell stage, with the three V-shaped chromosomes distinguishable by their char- acteristic splitting figures, which are fully explained below. Fig. 9, A and B, represents two adjoining cells of a 16- to 32-cell stage. In cell A, gb, we see three V-shaped chromosomes gfll 8a .. 8b FIG. 8. and the two long ones. In B, gc, we see again two of the V-- shaped chromosomes; and in gd the third one. The two long ones are distributed between c and d. The chromosomes in this stage are so small and crowded together that an accurate count of their total number is impossible. The figures 10-15, enlarged 4 diameters and in publication reduced one half, show splitting, or metakinesis, stages of 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 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
