The cell in development and inheritance . Fig-95. —Conjugation of the germ-nuclei and division of the spcim-aster in the sea-urchinToxopnciistes, X looo. (For later stages see Fig. 52.) A. Union of the nuclei; extension of the aster. B. Flattening of the sperm-nucleus against theegg-nucleus; division of the aster. 190 FERTILIZATION OF THE OVUM while in Chcetopteriis and Pieris the first polar spindle has advancedinto the anaphase.^ It is an interesting and significant fact that the aster or amphiasteralways leads the way in the march toward the egg-nucleus; and inmany cases it may be far in ad
The cell in development and inheritance . Fig-95. —Conjugation of the germ-nuclei and division of the spcim-aster in the sea-urchinToxopnciistes, X looo. (For later stages see Fig. 52.) A. Union of the nuclei; extension of the aster. B. Flattening of the sperm-nucleus against theegg-nucleus; division of the aster. 190 FERTILIZATION OF THE OVUM while in Chcetopteriis and Pieris the first polar spindle has advancedinto the anaphase.^ It is an interesting and significant fact that the aster or amphiasteralways leads the way in the march toward the egg-nucleus; and inmany cases it may be far in advance of the sperm-nucleus.^ Boveri(87, i) has observed in sea-urchins that the sperm-nucleus may indeedbe left entirely behind, the aster alone conjugating with the egg-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
