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Unformatted text preview: processes very briefly (using Fig. 47.3 to understand the reactions and processes). 47.4 What is the role of calcium ion in the fertilization (also see Fig. 47.4)? 47.5 What is the role of zona pellucida? Why mammals dont have the fast block to polyspermy? 47.6 Can you describe the cell cycle in the process of cleavage? Why the cells form into the blastomeres are much smaller than the original fertilized cells? 47.7 Use Fig. 47.6 and 47.8 to understand blastomeres, blastocoel, blastula 47.8 What happen in the gastrulation? What is the purpose for the process? 47.9 Please carefully study Fig. 47.14 to understand which parts of our body derived from which of the three germ layers? 47.10 Please study Fig. 47.16 to understand the time correspondence of the embryonic development processes. 47.11 Please study Fig. 47.18 to understand the convergent extension. 47.12 Review Chapter 47 in p. 1044-1045....
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- Spring '08