. Cytology, with special reference to the metazoan nucleus. Cells. ^. H The chromosomes of the beetle Blattella germanica. (Stevens, Carnegie Inst. Pub., 1905.) A, primary spermatocyte; B, prophase I.; C, metaphase I., polar view, showing twelve chromosomes, X not distinguish- able from the others in this view; D, portion of metaphase I., side view, showing X passing undivided to one pole ; E, late anaphase I. ; F, telophase I., X in one daughter nucleus only ; G, prophase II. of the secondary spermatocyte which contains the X chromosome ; H, polar view of metaphase II. of secondary spermatocy
. Cytology, with special reference to the metazoan nucleus. Cells. ^. H The chromosomes of the beetle Blattella germanica. (Stevens, Carnegie Inst. Pub., 1905.) A, primary spermatocyte; B, prophase I.; C, metaphase I., polar view, showing twelve chromosomes, X not distinguish- able from the others in this view; D, portion of metaphase I., side view, showing X passing undivided to one pole ; E, late anaphase I. ; F, telophase I., X in one daughter nucleus only ; G, prophase II. of the secondary spermatocyte which contains the X chromosome ; H, polar view of metaphase II. of secondary spermatocyte lacking the X chromosome ; I, similar figure of secondary spermatocyte containing the X chromosome; J, side view of metaphase II., showing the X chromosome dividing. cases which are doubtful or which present any special complication have been omitted. Group. Neuroptera . Orthoptera . Coleoptera Diptera . Hemiptera heteroptera Hemiptera homoptera Total Number of Species in which the Rcductional Division for the Sex Chromosomes is the First Division. I 88 38 II 2 43 183 Second Division. I O 2 O 68 I 72. 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
