https://embryology.med.unsw.edu.au/embryology/index.php?title=Russell1930_4&feed=atom&action=historyRussell1930 4 - Revision history2024-03-28T09:01:45ZRevision history for this page on the wikiMediaWiki 1.39.6https://embryology.med.unsw.edu.au/embryology/index.php?title=Russell1930_4&diff=391667&oldid=prevZ8600021 at 04:22, 3 December 20192019-12-03T04:22:31Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Weismann does, however, take into consideration the relation between phylogeny and ontogeny which finds expression in the fact of recapitulation. His theory allows for the origin of new determinants in the course of evolution, and the consequent appearance of new characters in ontogeny. Speaking of his determinants and groups of determinants, he writes :</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Weismann does, however, take into consideration the relation between phylogeny and ontogeny which finds expression in the fact of recapitulation. His theory allows for the origin of new determinants in the course of evolution, and the consequent appearance of new characters in ontogeny. Speaking of his determinants and groups of determinants, he writes :</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>‘That they do not enter into activity all at once, but successively take their part in development, seems to me a necessary consequence of their successive origin in the phylogeny ; and the ontogeny, as we shall see later, arises through a modified condensation of the phylogeny. Now since every new determinant that arises in the course of phylogeny can only develop by division and subsequent variation from the determinants which were previously active at the same place in the organism, it is quite intelligible that later on, when the phylogeny has been condensed in the ontogeny, they should not enter upon their active stage at the same time as their phyletic predecessors, but after them.’ 1</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>‘That they do not enter into activity all at once, but successively take their part in development, seems to me a necessary consequence of their successive origin in the phylogeny ; and the ontogeny, as we shall see later, arises through a modified condensation of the phylogeny. Now since every new determinant that arises in the course of phylogeny can only develop by division and subsequent variation from the determinants which were previously active at the same place in the organism, it is quite intelligible that later on, when the phylogeny has been condensed in the ontogeny, they should not enter upon their active stage at the same time as their phyletic predecessors, but after them.’ 1</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In the foregoing discussion we have dealt only with the broad outlines of Weismann’s theory, and mainly with the theory as set out in the first edition of the V or tr age (1902). Much detail has accordingly been omitted, and it should be noted that Weismann modified some of his views in the light of advancing knowledge. 2 The main underlying ideas remain however the same, and it is his earlier writings that are historically important.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In the foregoing discussion we have dealt only with the broad outlines of Weismann’s theory, and mainly with the theory as set out in the first edition of the V or tr age (1902). Much detail has accordingly been omitted, and it should be noted that Weismann modified some of his views in the light of advancing knowledge. 2 The main underlying ideas remain however the same, and it is his earlier writings that are historically important.</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>2 See the third edition of the Vortrage , 1913.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>2 See the third edition of the Vortrage , 1913.</div></td></tr>
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</table>Z8600021https://embryology.med.unsw.edu.au/embryology/index.php?title=Russell1930_4&diff=391453&oldid=prevZ8600021 at 03:01, 2 December 20192019-12-02T03:01:40Z<p></p>
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</table>Z8600021https://embryology.med.unsw.edu.au/embryology/index.php?title=Russell1930_4&diff=391433&oldid=prevZ8600021 at 02:48, 2 December 20192019-12-02T02:48:27Z<p></p>
<a href="https://embryology.med.unsw.edu.au/embryology/index.php?title=Russell1930_4&diff=391433&oldid=391409">Show changes</a>Z8600021https://embryology.med.unsw.edu.au/embryology/index.php?title=Russell1930_4&diff=391409&oldid=prevZ8600021: Created page with "IV THE GERM-PLASM THEORY[edit] I N the charming preface to his Vortrdge uber Descendenztheorie (1002) Weismann remarks that a theory to be really valuable and stimulating shou..."2019-12-02T02:32:07Z<p>Created page with "IV THE GERM-PLASM THEORY[edit] I N the charming preface to his Vortrdge uber Descendenztheorie (1002) Weismann remarks that a theory to be really valuable and stimulating shou..."</p>
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