. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 288 SALLY HUGHES-SCHRADER Already on emergence from the confused stage of late pachytene the bivalents show a marked degree of separation between homologues (Fig. 34). This may be uniform along their entire length, or variously accentuated in different regions. If uniform, the homologues are clearly separated and indubitably devoid of chiasmata (Fig. 37, a, after Feulgen, and e, gentian violet). [Occasionally a cross section of such a bivalent shows all four chromatids equally spaced (Fig. 37, f), * u .-,* * *. -* » f h FIGU
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 288 SALLY HUGHES-SCHRADER Already on emergence from the confused stage of late pachytene the bivalents show a marked degree of separation between homologues (Fig. 34). This may be uniform along their entire length, or variously accentuated in different regions. If uniform, the homologues are clearly separated and indubitably devoid of chiasmata (Fig. 37, a, after Feulgen, and e, gentian violet). [Occasionally a cross section of such a bivalent shows all four chromatids equally spaced (Fig. 37, f), * u .-,* * *. -* » f h FIGURE 37. Choeradodis rhombicollis. Individual bivalents at pseudo-diakinesis. a-d, Feulgen; e-h, gentian violet. but such figures are rare and I have not observed chromatid separation in any others.] Prometaphase bivalents of this type probably assume a Callimantis-like form at metaphase as in bivalent 2 in Figure 38, or if more widely opened, produce simple rings such as bivalents 1 and 3 in the same figure. In other bivalents, homologues are moderately and uniformly separated at one end, but flare widely apart at the other as though mutually repelling each. 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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