The lab time will be divided into four periods, followed by a final study period to answer the general questions at the end of this lab. Pages 590-594 in Campbell briefly review the similarities and differences in overall body plans of animals. Explain the difference between radial and bilateral symmetry. Review the process of gastrulation outlined in Fig. 29.3 and illustrated in the slides on display.
Gastrulation leads to the development of different germ layers in the embryo.
Review figure 29.4 and the text to understand the structure and function of a coelom and observe the x-sections of acoelomate, pseudocoelomate and coelomate animals on display. Explain carefully the evidence for your answer. Note the other developmental differences between protostome and deuterostome phyla described in figure 29.5. Describe the evidence for homology between an annelid worm's mouth and a rat's anus. Examine the clasping tendrils of Passiflora and the spines of Bouganvillea .