In Figure 21.11b, the lower cells are synthesizing signaling molecules, where as the upper cells are expressing receptors for those molecules. In terms of gene regulation, explain how these cells came to synthesize different molecules. The DNA sequences called homeoboxes, which help homeotic genes in animals direct development, are common to flies, mice and humans. Given this similarity, explain why these animals are so different from each other? C. elegans is a model organism for studying apoptosis in the development of animals. Explain the importance of apoptosis in the development of multicellular organisms.
In Figure 21.11b, the lower cells are synthesizing signaling molecules, where as the upper cells are expressing receptors for those molecules. In terms of gene regulation, explain how these cells came to synthesize different molecules. The DNA sequences called homeoboxes, which help homeotic genes in animals direct development, are common to flies, mice and humans. Given this similarity, explain why these animals are so different from each other? C. elegans is a model organism for studying apoptosis in the development of animals. Explain the importance of apoptosis in the development of multicellular organisms.
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