. Cytology, with special reference to the metazoan nucleus. Cells. i66 CYTOLOGY CHAF. fact that the first three nuclei of a triaster have a far greater chance of each getting a representative of all the chromosomes of the series than have the four nuclei of the Fig. 76. Development of dispermic Echinoderm eggs. (After Boveri, Zellen-Studien, 1907.) A, blastula of 'the tetraster type {Echinus). About one quarter of the wall of the blastula is'falling into separate cells; B, C, D, plutei from triaster eggs (Strongylocentrotus). B, with a normal skeleton on the left side, rudimentary
. Cytology, with special reference to the metazoan nucleus. Cells. i66 CYTOLOGY CHAF. fact that the first three nuclei of a triaster have a far greater chance of each getting a representative of all the chromosomes of the series than have the four nuclei of the Fig. 76. Development of dispermic Echinoderm eggs. (After Boveri, Zellen-Studien, 1907.) A, blastula of 'the tetraster type {Echinus). About one quarter of the wall of the blastula is'falling into separate cells; B, C, D, plutei from triaster eggs (Strongylocentrotus). B, with a normal skeleton on the left side, rudimentary on the right; C, with skeleton present on left side only ; D, a perfect pluteus. The dotted lines indicate the boundaries of the regions derived from the three primary blastomeres. Note the difference in the size of the nuclei in the different regions. Boveri also reared tetraster and triaster dispermic eggs as whole embryos ( without separating the first four or three blastomeres. 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, W. E. (Wilfred Eade), 1882-1951. London, Macmillan and Co. , limited
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcells, bookyear1920
