. Embryology. Embryology; Embryology; genealogy. TOP VIEW SIDE VIEW FIRST CLEAVAGE. COMPLETE EMBRYOS Fig. 23. The significance of the gray crescent as revealed by separating the cells at the two-cell stage. Left: The gray crescent is shown in top view. When this egg divides, one half of the gray crescent passes into each of the two cells. If these cells are separated from each other each cell will form a com- plete embryo. Right: A side view of the gray crescent and a first cleavage in which one cell contains all of the crescent, while the other cell lacks any part of it. If these cells are se
. Embryology. Embryology; Embryology; genealogy. TOP VIEW SIDE VIEW FIRST CLEAVAGE. COMPLETE EMBRYOS Fig. 23. The significance of the gray crescent as revealed by separating the cells at the two-cell stage. Left: The gray crescent is shown in top view. When this egg divides, one half of the gray crescent passes into each of the two cells. If these cells are separated from each other each cell will form a com- plete embryo. Right: A side view of the gray crescent and a first cleavage in which one cell contains all of the crescent, while the other cell lacks any part of it. If these cells are separated, the one lacking the crescent fails to develop. 57. 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 Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press
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