. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 74 H. M. LENHOFF Primary Axis. Primary Embryo Induced Secondary Embryo Induced Secondary Axis Figure 2. Mangold-Spemann transplantation experiment. Mangold removed the dorsal lip of the blas- topore from a donor amphibian embryo (stippled), grafted it to the flank of a host embryo, and thereby induced a secondary axis of polarity in the host that eventually developed into a secondary embryo. sac-like hydra as a diploblastic gastrula with a ringlet of tentacles emanating from the lips surrounding the "blas- topore,"
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 74 H. M. LENHOFF Primary Axis. Primary Embryo Induced Secondary Embryo Induced Secondary Axis Figure 2. Mangold-Spemann transplantation experiment. Mangold removed the dorsal lip of the blas- topore from a donor amphibian embryo (stippled), grafted it to the flank of a host embryo, and thereby induced a secondary axis of polarity in the host that eventually developed into a secondary embryo. sac-like hydra as a diploblastic gastrula with a ringlet of tentacles emanating from the lips surrounding the "blas- topore," her results bear a remarkable resemblance to those of the organizer experiments that Spemann and Mangold (1924) reported 15 years later using amphibian embryos. Structure and Development of the Diploblastic Hydras Before reviewing Browne's key experiments in detail, it is important to understand the basic structure and de- velopment of hydras. The hydra is a simple diploblastic epithelial animal made up of two cell layers—the ecto-. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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