. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SECOND DIVISION Dw. 40 50 60 70 80 90 100 TIME AFTER FERTILIZATION (in minutes) FIGURE 3. First and second division times of diploid whole eggs and of diploid and haploid quarter-eggs; Diploid whole eggs (Dw, closed circles); Diploid quarter-eggs (Di/4, open triangles) ; Haploid quarter eggs (Hi/4, open circles). Neither ploidy nor cell volume appeared to influence the duration of the second mitotic cycle. An extreme test involved comparing diploid whole cells with haploid and diploid quarter-sized eggs. The times of 50% fir
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SECOND DIVISION Dw. 40 50 60 70 80 90 100 TIME AFTER FERTILIZATION (in minutes) FIGURE 3. First and second division times of diploid whole eggs and of diploid and haploid quarter-eggs; Diploid whole eggs (Dw, closed circles); Diploid quarter-eggs (Di/4, open triangles) ; Haploid quarter eggs (Hi/4, open circles). Neither ploidy nor cell volume appeared to influence the duration of the second mitotic cycle. An extreme test involved comparing diploid whole cells with haploid and diploid quarter-sized eggs. The times of 50% first divisions of the whole eggs and the diploid quarter-sized cells did not differ by more than one minute, while the haploid quarter was delayed 7 minutes (Fig. 3, Table I). The durations of the second mitotic cycles of the whole embryos and the diploid quarter-sized ones were identical. The three-minute difference in the duration of the second cycle measured for the haploid quarter-sized embryos is not significant (Fig. 3, Table I). Hence, the duration of the second mitotic cycle is not influenced by a twofold variation in the ploidy or by a fourfold variation in the cytoplasmic volume. Additional observations on the time of the fourth mitosis of whole, and both haploid and diploid quarter-eggs indicated that size had no obvious cumulative effect on the time of the fourth mitosis. Similarly, in haploid half-sized embryos 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
