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- Geoffroy's experiments supported epigenesis, a theory that an organism's form emerges gradually in development, and that it isn't preformed or predetermined in the zygote or fertilized egg. As a result of this work, Geoffroy created the scientific field of teratology, the study of abnormalities in development.
embryo.asu.edu › pages › etienne-geoffroy-saint-hilaire-1772-1844Etienne Geoffroy Saint-Hilaire (1772-1844) | Embryo Project ...
Aug 5, 2013 · Etienne Geoffroy Saint-Hilaire, commonly known as Geoffroy, studied animals, their anatomy and their embryos, and teratogens at the National Museum of Natural History in Paris, France in the eighteenth and nineteenth centuries.
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Jun 15, 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
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.
Dec 1, 2021 · However, it was Geoffroy Saint-Hilaire who first highlighted the need for generalized approach to be handled by the methods based on the relationships among embryogenesis, teratology, zoology and comparative anatomy to confer them a higher explicative power.
- Giuseppe Iurato, Abir U. Igamberdiev
- 2021
May 20, 2021 · 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.
- Andrés Galera
- andres.galera@cchs.csic.es
- 2021
In his efforts to experimentally demonstrate the theory of recapitulation, Geoffroy developed techniques to intervene in the growth of embryos to see whether they would develop into different kinds of organisms. Moreover, Geoffroy emphasized the concept of l'unite de composition (the unity of plan).
Arrested development – Monsters and teratology – Geoffroy’s ideas about the variability of species; abrupt transitions; influence of the environment – Extension of the theory of the unified plan of composition of articulated
