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- His studies on embryos supplied important evidence for his views on the unity of organic composition among vertebrates, which he now defined in three parts: the law of development, whereby no organ arises or disappears suddenly, explaining vestiges; the law of compensation, stipulating that one organ can grow disproportionately only at the expense of another; and the law of relative position, stating that the parts of all animals maintain the same positions relative to each other.
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Apr 11, 2024 · Étienne Geoffroy Saint-Hilaire was a French naturalist who established the principle of “unity of composition,” postulating a single consistent structural plan basic to all animals as a major tenet of comparative anatomy, and who founded teratology, the study of animal malformation.
- The Editors of Encyclopaedia Britannica
Geoffroy was among the first to grasp an extremely important concept. For Charles Darwin and for evolutionary biologists after him, defining and identifying homologous structures became both an important source of support for evolution and an important tool for identifying evolutionary relationships.
Dec 1, 2021 · Geoffroy Saint-Hilaire defined the influence of environment as a direct induction operating during embryogenesis. He attempted to test these ideas in his numerous direct experiments on chicken eggs and other embryos.
- Giuseppe Iurato, Abir U. Igamberdiev
- 2021
Étienne Geoffroy Saint-Hilaire (15 April 1772 – 19 June 1844) was a French naturalist who established the principle of "unity of composition". He was a colleague of Jean-Baptiste Lamarck and expanded and defended Lamarck's evolutionary theories. Geoffroy's scientific views had a transcendental flavor (unlike Lamarck's materialistic views ...
Aug 5, 2013 · Geoffroy's conceptual contributions, as well as his experimental research, influenced embryological research on animal morphology and teratogens, and later the field of evolutionary paleontology. Geoffroy was born 15 April 1772 in Étampes, France, a town south of Paris. Geoffroy was the seventh of fourteen children.
However, the French naturalist Étienne Geoffroy Saint-Hilaire developed an embryological evolutionary model in the 1820s that followed the Lamarckian theory. Geoffroy was the first to establish a direct embryological relationship between vertebrates and invertebrates.
Sep 27, 2018 · The “Sacred Ibis debate” predates the so-called “Great Debate” between Cuvier and Geoffroy Saint-Hilaire and the publication of Darwin’s On the Origin of Species five decades later. Cuvier’s views and his study had a profound influence on the scientific and public perception of evolution, setting back the acceptance of evolutionary ...
