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Q.
In the development of a frog, the gastrulation process involves
Structural Organisation in Animals
Solution:
In gastrulation, morphogenetic movement of cells occur in the embryo. The morphogenetic movement patterns are Epiboly - It represents the natural tendency of epithelial sheet to expand into free area over a substratum. Emboly - It is just opposite to epiboly. In emboly, sheets fold in or invaginate; that is a sheet migrates inside a cell aggregate or beneath another layer because of local changes in cell shape and motility. Invagination - It is the sinking in (in pocketing) of a layer of cells and is similar to functioning in expanding layers at a specific point.