BIOL 1108 Lecture Notes - Lecture 16: Blastula, Flatworm, Gastrulation
Document Summary
Review: a goal of modern biology is that taxonomy should reflect phylogeny. Fungi, plantae and animalia separately evolved from single-celled eukaryotes. Animals are multicellular, heterotrophic eukaryotes that lack cell walls. The life cycle of animals is dominated by the diploid stage. Development of all animals involves coordinated events from the molecular genetics to the organism level. How many: 1. 5 million species have been described , an estimated 5-30+ million species exist. From what did animals evolve: to answer this: We need to review our approach to classification and the. Reconstruction of evolutionary relationship: fungi, plantae and animalia separately evolved from single-celled eukaryotes. Eukarya is a monophyletic taxon with multiple synapomorphies of cell structure. Eukarya includes both single- and mutli-celled organisms. Remember that within the eukarya, there are multiple major groups with unclear relationships. The choanoflagellates resemble a cell type in basal animals, reflecting a sister taxon relationship.
