BIO 1130 Lecture Notes - Lecture 4: Symmetry In Biology, Choanocyte, Symplesiomorphy

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Bio 1130 cambrian and ordovician periods (paleozoic eon) Continental shells very shallow allow light to penetrate algae can easily grow. Animal architecture tissues: none, diploblastic (2 tissue layers, triploblastic (3 tissue layers) symmetry and cephalization, asymmetry, radial, bilateral embryology, protostome, deuterostome body cavities, coelomate, pseudocoelomate, acoelomate. Porifera sponges takes coanocytes and places them in a water-generated system doesn"t have cell-to-cell junction no communication animal before tissues arise totipotent. Sponge sex choanocytes become sperm archeocytes form egg. Animal innovations (symplesiomorphies) gap (septate) junctions loss of the choanocyte true tissues with all components internal digestive epithelium oral- aboral axis and symmetry. Animal architecture: tissues no tissues dipoblastic germ layers (ectoderm & endoderm) tripoblastic germ layers (ectoderm, mesoderm, endoderm) 8 cell embryo: spiral cleavage, radial cleavage. Protostomes vs deutorostomes protostomes: blastopore mouth, spiral cleavage, schizocoely deutorostomes, blastopore anus, radial cleavage, enterocoley. Body cavities acoelomate: organisms w/ no body cavity pseudocoelomate, partial body cavity coelomate.