. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8 10 11 12 13 14 15 16 17 IS 19 20 21 22 6 FIGURE 6. Karyotype obtained from the pre-metaphase chromosome spread preparation of Figure 2. Total magnification of the chromosomes, approximately 4000 X. Echinarachnius pan/ut. The chromosomes of the egg of the sand dollar also were examined by this method. These1 much larger eggs are more difficult to study because of the wide area ot dispersion of the chromosomes in the cytoplasm in spread preparations, ('omits gave either 44 or 46 chromosomes for the diploid number. The chromo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 8 10 11 12 13 14 15 16 17 IS 19 20 21 22 6 FIGURE 6. Karyotype obtained from the pre-metaphase chromosome spread preparation of Figure 2. Total magnification of the chromosomes, approximately 4000 X. Echinarachnius pan/ut. The chromosomes of the egg of the sand dollar also were examined by this method. These1 much larger eggs are more difficult to study because of the wide area ot dispersion of the chromosomes in the cytoplasm in spread preparations, ('omits gave either 44 or 46 chromosomes for the diploid number. The chromosomes of the sand dollar are somewhat larger than those of the sea urchin, and the centromere position tends to he more medial. An unequivocal karyotype still cannot be determined with any accuracy. Karyotype oj - "- >•' Arbacia punctulata during llirjirsl cleavage division ( liromosome 1 •i I 5 '' 10 1 t 15 H> 17 1 ') 20 1 \ 11 I i -up Large chromosomes, \ terminal cehtromeres Chromosomes not as ^c, IHHIT medial eenlroimTes Medium size chromosomes, approximately rent nmu-rr- \li-dmm size chromosomes, sub-median centromeres Mcdmni >i/c chromosomes, nearh' terminal cenlroinci'o Smaller chromosomes, nearly terminal centromeres Shmi chromosomes, --nli-mc<lian reiilromrir-- Shori chromosomes, inmc nn-dial ccnirdincrcs \ i i \ Inn i chromosomes, approximately median centromeres. 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
Size: 2895px × 863px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
