多足類の染色体研究第VIII報 : X線によるゲジの性染色体の切断

概要

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The X- and Y-chromosomes of the Thereuonema hilgendorfi are represented by two huge bodies characterized by the diffuse spindle attachment. The X-element carrys two constrictions which divide the body into three distinct segments, while the Y shows one such constriction. X-ray induced fragmentation in both the sex-chromosomes and the autosomes; the X, as well as the Y, were devided into many fragments. The fragmentation occurred in both elements irrespective of their constrictions. The X-ray treatment also produced many other cytological abnormalities, of which remarkable are stickiness of chromosomes, deformation of chromosomes into unusual bodies, lagging of chromosomes, appearance of chromosome bridges at anaphase, irregular chromosome distribution at anaphase, scattering or displacement of chromosomes at metaphase, abnormal orientation of chromosomes at metaphase and multipolar mitoses.
1955-05-15