(See chapter 13 for an extended discussion of involution.) The movement of cells through the blastopore from the exterior to the interior of the embryo during gastrulation. The process by which the overlying ectoderm spreads over the surface of the embryo.Ī portion of an embryo cultured in isolation in order to test its commitment to a specified cell fate.Ī map produced by observing normal developmental fates of regions of the blastula.Ī gray-colored crescent on the embryo opposite the site of sperm entry formed by the movement of the pigmented cortex over portions of the yolk during cortical rotation. The combined effect of a generalized mesoderm induction superimposed on a secondary localized dorsal induction. The region of the blastula between the animal and vegetal cap that is adjacent to the blastopore on the dorsal side of the embryo. Located just dorsal to the site of invagination of the blastopore, these cells will begin involution through the blastopore. The rotation of the pigmented cortex with respect to the underlying yolk patelets, which is induced by fertilization and is important for dorsalization in Xenopus. The site of bottle cell formation, invagination, and involution.Ĭells of the dorsal marginal zone that adopt a particular cellular morphology by apical constriction and invaginate, forming the blastopore.Ī map produced through transplantation studies to test the developmental potential of different regions of the blastula. The fluid-filled space of the blastula that forms during cleavage. The cavity that is formed during the process of gastrulation and will form the lumen of the gut. The region of the blastula at the animal pole.
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