Assignment Instructions/ Description
What type of egg does an amphibian have? What is its pattern of cleavage? 2. What is the gray crescent, and when do you see it in amphibian development? What is the normal position of the gray crescent with respect to the first cleavage furrow? 3. Describe the relative changes in blastomere sizes in the animal and vegetal poles from the start of cleavage to the blastula stage. 4. What changes take place during gastrulation. 5. What is the notochord? When is the notochord first apparent? How are its cells distinctive from those of neighboring tissues? 6. Why does organogenesis begin with neurulation?
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