. Embryology. Embryology; Embryology; genealogy. rERTILIZED EGG. Fk;. 3. A sea urchin egg in the process of fertilization. The fertilized egg divides once, and two cells result. Each of the two cells divides, and the four resulting cells are shown, 1, 2, 3, 4. The four-cell stage is then placed in sea water from which calcium has been removed. The Ca-free sea water dissolves a protein which holds the four cells together and a mild shaking separates them. The four cells are separated and continue to develop into sea urchin larvae, which are called plutei. Each of the four larvae has all the str
. Embryology. Embryology; Embryology; genealogy. rERTILIZED EGG. Fk;. 3. A sea urchin egg in the process of fertilization. The fertilized egg divides once, and two cells result. Each of the two cells divides, and the four resulting cells are shown, 1, 2, 3, 4. The four-cell stage is then placed in sea water from which calcium has been removed. The Ca-free sea water dissolves a protein which holds the four cells together and a mild shaking separates them. The four cells are separated and continue to develop into sea urchin larvae, which are called plutei. Each of the four larvae has all the structures of the normal larva but is only one fourth normal size. Presumably each pluteus would grow and transform into a normal adult sea urchin. How does the original egg develop into a single individual when several individuals may be obtained from one egg?. 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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Keywords: ., boo, bookcentury1900, booksubjectembryology, booksubjectgenealogy
