Give the site of embryonic development in frog.
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When sperm fertilize the egg, streaming movements are set up in the egg and these results in distribution of materials. So that three regions can be seen, the upper animal hemisphere (pole) which is pigmented and lower white vegetal pole. Between the two hemispheres, there is a small are with no pigment called grey crescent.
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The blastula stage occurs when a hollow ball of cells forms around a cavity filled with fluid.
- Gastrulation in the frog begins at a point on the embryo surface roughly 180 degrees opposite the point of sperm entry with the formation of a dimple, called the blastopore. Cells migrate through the blastopore and toward the animal pole (Figure 2.3A,B). These cells become the dorsal mesoderm.
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