BIOL 211 Lecture 6: Exam 2 Notes
29 Sep 2017
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Introduction to animal diversity kingdom anamalia: chapter 30. Closest relatives are choanoflagellates: belong to eukaryotic protists. 600,000,000-1. 5 billion years: 570,000,000-year-old animal embryo fossils from china. Haootia quadriformis: earliest fossil of animal with muscle tissue, found in newfoundland, over billion-years-old. Other animal characteristics: move under own power at some point, specialization of cell types, regulation of cell cycling & growth, cell adhesive. I(cid:374)(cid:374)ate i(cid:373)(cid:373)u(cid:374)it(cid:455) (cid:894)(cid:862)(cid:373)e(cid:863) (cid:448)s (cid:862)othe(cid:396)(cid:863)(cid:895: development regulation, programmed cell death. Molecular phylogeny: current method to organize & classify animals, based on comparisons of dna sequences. Choanoflagellates: protist, some are colonial, flagellated, salt water & fresh water, closest living relative to animals. Similarities between choanoflagellates & sponges: some choanoflagellates are colonial, sponges first animal in fossil record, both are sessile organisms, both feed with similar structures. Tissues: metazoan- all animals, divided into, parazoan- (no specialized tissues or organs, porifera sponges, eumetazoan (more than one type of tissue & organs)
