BIOL108 Lecture Notes - Lecture 19: Blastomere, Choanoflagellate, Bilateria

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Lien Luong

Document Summary

Animals with true tissues tissue = integrated group of cells with a common structure & function, isolated from other tissues by membranous layers. Aggregate of cells; specialized cells for different functions. Specialized cells aggregated into distinct tissues; more advanced designs tissues combine to form organs. Sponges do have the genetic tool kit needed for cell-cell & cell-extracellular matrix adhesion, most do not have complex tissues. Animals other than sponges are divided into 2 groups this division is based on the # of the embryonic tissue layers (aka germ layers) they have. Bilateria : 3 embryonic cell layers triploblastic: endo-, ecto- & mesoderm. Single flagellum surrounded by a collar of microvilli (fingerlike projections of cell membrane) Cell morphology very similar to that of sponges (phylum porifera) Many lineages of fungi (3), algae (6), and animals (1) evolved multicellularity independently from unicellular ancestors.