BIO 111 Chapter Notes - Chapter 38: Germinal Disc, Blastula, Blastocoel
Document Summary
38. 2 cleavage creates building blocks and produces a blastula. Cleavage the initial process that creates cellular building blocks to form the new organism by producing many smaller cells from one. Blastomeres the cells produced from cleavage. The amount of yolk affect cleavage: the presence of yolk slows/ impedes cell division, small amounts of yolk work as was explained earlier, moderate amounts of yolk work as well, but much slower in yolk filled areas. This causes there to be slow dividing cells in the vegetal hemisphere and fast dividing cells in the animal hemisphere. Trophoblast the surrounding outer cells that become an encompassing sac. The cells secrete a fluid causing a blastocoel with the embryo at one end. Blastocyst the separation of the inner cell mass and trophoblast cells. Implantation the attachment of the early embryo to the uterine wall. 38. 3 gastrulation produces a second then a third germ layer]
