A Textbook of General Embryology
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WTien the centrosome appears in the egg, in connection with the middle piece of the entering spermatozoon, it is possible, though not likely, that this is really the same centrosome that was present in the spermatid, and that there is consequently a genetic continuity of centrosomes, from gen- eration to generation, as well as of nuclear components. Such a continuity has, however, not been definitely observed. On the other hand, it may be that the middle piece forms, either from its own substan...ce, or from that of the egg, a new centro- 182 GENERAL EMBRYOLOGY FIG. 94. Fertilization in Ascaris megalocephala bivalens. From Wilson, "Cell, " after Boveri. (Later stages are shown in Fig. 36. ) A. The spermato- zoon has entered the egg, its nucleus is shown at cT; beside it lies the granular mass of "archoplasm" (attraction-sphere); above are the closing phases in the formation of the second polar body (two chromosomes in each nucleus). B. Germ-nuclei (9, d" 1 ) in the reticular stage; the attraction-sphere (a) contains the dividing centrosome.
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To quickly assess the difficulty of the text, read a short excerpt:
WTien the centrosome appears in the egg, in connection with the middle piece of the entering spermatozoon, it is possible, though not likely, that this is really the same centrosome that was present in the spermatid, and that there is consequently a genetic continuity of centrosomes, from gen- eration to generation, as well as of nuclear components. Such a continuity has, however, not been definitely observed. On the other hand, it may be that the middle piece forms, either from its own substan...ce, or from that of the egg, a new centro- 182 GENERAL EMBRYOLOGY FIG. 94. Fertilization in Ascaris megalocephala bivalens. From Wilson, "Cell, " after Boveri. (Later stages are shown in Fig. 36. ) A. The spermato- zoon has entered the egg, its nucleus is shown at cT; beside it lies the granular mass of "archoplasm" (attraction-sphere); above are the closing phases in the formation of the second polar body (two chromosomes in each nucleus). B. Germ-nuclei (9, d" 1 ) in the reticular stage; the attraction-sphere (a) contains the dividing centrosome.
What to read after A Textbook of General Embryology?
You can find similar books in the "Read Also" column, or choose other free books by William Erskine Kellicott to read onlineMoreLess
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