BIOL 200B 1st Edition Lecture 5 Wed. Jan. 28 Protists (chapter 30) I. Protistsa. Definition “Protista”b. Protest diversification II. Origin of mitochondria III. Origin of ChloroplastsIV. Sexual reproductionV. Protists as pathogens Fri. Jan. 30 Animal Diversity (chapter 33) I. AnimalsII. Animal Evolutiona. Origin of Tissuesb. Origin of Bilateral Symmetryc. Origin of Body Cavityd. Origin of the Anus in BilateriansIII. Key AdaptationsChapter 33 Animal DiversityAnimals:- Multicellular- Heterotrophic eukaryotes- Lack cell walls - Ingest their foodBoundary between Protists and Animals:- Choanoflagellates – sessile(stationary) protists; some are colonial- closest living relative of animals- Sponges – multicellular, sessile animals- Lack complement of tissue types found in other animals- Sister groupThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Animal Evolution:Part 1: Origin of Tissue (specialized group of cells)- No tissue, just collections of cells- Epithelium – surface tissue- Diploblasts – 2 germ layers- Triploblasts Part 2: Origin of Bilateral Symmetry and Its Correlates- Radial symmetry – 2 or more planes of symmetry- Nerve net; hydra- Bilateral symmetry – only 1 plane (left-right)- Central nervous system (cephalization)According to the niche concept; benefits/ costs of bilateral symmetry and cephalization:- Sense and move towards food – new resources- More noticeable to predatorsPart 3: Origin of body cavity (coelom) in Triploblasts- Acoelomates – no body cavity- Coelomates – have a fluid filled cavity- Coelom forms in the mesoderm- Hydrostatic skeleton- Coordinated muscle contractions – result in movementPart 4: (embryonic) Origin of the anus in bilaterians - Gastrulation – formation of gut and embryonic tissue layer Protostomes – pore becomes mouth Deuterostomes – pore becomes anus- Highly organized cell movements radically rearrange embryonic cells into structure called gastrula- Germ layers give rise to adult tissues and organs (pg 424-425) Ectoderm – forms outer covering Mesoderm – muscle Endoderm – lining of gut- Pg 414-416- Hox genes – specify which body structure to build Homologous across animalsKey Adaptations: Diet, Feeding modes, Mouthparts- Detrivores – eat dead animals- Suspension/ filter feeders – sponges- Deposit feeders – worms- Herbivores – eat plants or algae- Molars for grinding- Predators – Insectivores and Carnivores; eat animals- Parasites – harvest nutrients from, but don’t kill, their
View Full Document
Unlocking...