Development Lab. Biology 113. Yolk Distribution. Isolecithal Telolecithal. Holoblastic versus Meroblastic cleavage. Holoblastic cleavage , the complete division of the egg occurs in species whose eggs have little or moderate amounts of yolk, such as sea urchins and frogs
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Gastrula in which the surface pushes into the interior at a point called the blastopore to form a tube that will become the digestive system.
In a gastrula the cells on the outside are ectoderm, those lining the inner tube are endoderm, and cells that migrate and multiply between these layers will become the mesoderm.