The Story of Lifes Mechanism a Review of the Conclusions of Modern Biology in
The Story of Lifes Mechanism a Review of the Conclusions of Modern Biology in
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of the egg (Figs. 36 and 37). The egg now divides (Fig. 38), but the division is of a peculiar kind. Although the chromosomes divide equally the egg itself divides into two very unequal parts, one part still appearing as the egg and the other as a minute protuberance called the polar cell (pc' in Fig. 38). The chromosomes do not split as they do in the cell division already described, THE CELL AND PROTOPLASM.
125 but each of these two cells, the egg and the polar body, receives four chromosomes... (Fig. 38). The result is that the egg has now the normal number of chromosomes for the ordinary cells of the ani- mal in question. But this is still too many, for the egg is soon to unite with the male cell ; and this male cell, as we shall see, is to bring in its own quota of chromosomes. Hence the egg must get rid of still more of its chromatin material.
PC' FIG. 40.
5. First division complete and first polar cell formed, pc'. ). Formation of the second polar cell, FIG. 38. I FIG. 39. Formation of the second polar cell, pc" FIG.
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To quickly assess the difficulty of the text, read a short excerpt:
of the egg (Figs. 36 and 37). The egg now divides (Fig. 38), but the division is of a peculiar kind. Although the chromosomes divide equally the egg itself divides into two very unequal parts, one part still appearing as the egg and the other as a minute protuberance called the polar cell (pc' in Fig. 38). The chromosomes do not split as they do in the cell division already described, THE CELL AND PROTOPLASM.
125 but each of these two cells, the egg and the polar body, receives four chromosomes... (Fig. 38). The result is that the egg has now the normal number of chromosomes for the ordinary cells of the ani- mal in question. But this is still too many, for the egg is soon to unite with the male cell ; and this male cell, as we shall see, is to bring in its own quota of chromosomes. Hence the egg must get rid of still more of its chromatin material.
PC' FIG. 40.
5. First division complete and first polar cell formed, pc'. ). Formation of the second polar cell, FIG. 38. I FIG. 39. Formation of the second polar cell, pc" FIG.
What to read after The Story of Lifes Mechanism a Review of the Conclusions of Modern Biology in?
You can find similar books in the "Read Also" column, or choose other free books by H W Herbert William Conn to read onlineMoreLess
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