. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. FiG. 79. Side and polar views of the equatorial plate in the meiosis of certain Lepidoptera and their hybrids. (After Federiey, , 1913.) A, B, Pygaera anachoreta, 30 bivalents; C, D, P. curtuUi, 29 bivalents ; E, ¥, P. anachoreta x P. curtula, hybrid ; in E, 3 chromosomes are bivalent, the rest univalent; in F, 56 or 57 chromo- somes can be seen, two or three are bivalent, the rest univalent. G, H, secondary hybrid obtained by crossing the iirst hybrid back with P. anachoreta 9; in G a mixture of univalents
. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. FiG. 79. Side and polar views of the equatorial plate in the meiosis of certain Lepidoptera and their hybrids. (After Federiey, , 1913.) A, B, Pygaera anachoreta, 30 bivalents; C, D, P. curtuUi, 29 bivalents ; E, ¥, P. anachoreta x P. curtula, hybrid ; in E, 3 chromosomes are bivalent, the rest univalent; in F, 56 or 57 chromo- somes can be seen, two or three are bivalent, the rest univalent. G, H, secondary hybrid obtained by crossing the iirst hybrid back with P. anachoreta 9; in G a mixture of univalents and bivalents; in H, 56 chromosomes can be counted ; namely, about 30 large bivalents (the anachoreta chromosomes), and about 26 small univalents (the curtula chromosomes). tion between the constituents of the bivalents in the meiotic division is characteristically very loose). According to the latter authority these 21 chromosomes are separated at anaphase into groups of lo and ii, rarely 9 and 12. According to Geerts the constituents of the bivalents separate normally, sending 7 to each pole, while the remaining 7 uni- valents suffer various fates—some being irregularly distributed to 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 Agar, Wilfred Eade, 1882-. London Macmillan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcells, bookyear1920
