. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. w^ 0 Wo 80 120 160 200 HOURS DEVELOPMENT 18®C Fig. 3. Development of embryos in the hybrid Rana pipiens 9 x Rana stjlvatica $. (Reconstructed from data of Moore, 1946.) Figure 3 is a schematic representation of the developmental events just outlined. Morphogenetic Move
. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. w^ 0 Wo 80 120 160 200 HOURS DEVELOPMENT 18®C Fig. 3. Development of embryos in the hybrid Rana pipiens 9 x Rana stjlvatica $. (Reconstructed from data of Moore, 1946.) Figure 3 is a schematic representation of the developmental events just outlined. Morphogenetic Movements Unfortunately, we are not in possession of an adequate gen- eral theory of amphibian gastrulation in terms of which we can explain hybrid developmental patterns. Nor, for that matter, do we have precise ways even of describing various tissue move- ments that occur when embryos gastrulate. Nevertheless, gas- trulating amphibians all exhibit movements belonging to some roughly identifiable types. The classification following is useful for our present purpose. A more exhaustive one is given by Nel- son (1953).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Association for the Advancement of Science. Section on Zoological Sciences; Tyler, Albert, 1906-. Washington
Size: 1834px × 1362px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherwashington, booksubjectembryology
