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bsc111 exam 2:ch 32

j.sellers: 31,32,33

QuestionAnswer
What is an animal? -Eukaryotic, multi-cellular, heterotrophic (ingestion) -lack cell walls -muscle and nervous tissue -most reproduce sexually -developmental progression
What is an animal? -zygote, cleavage(succesion of miotic cell division), blastula (multicellular stage), gastulation, gastrula, larva(sexually immature), metamorphosis -hox genes that regulate the development of the body
4 evolutionary brand points: 1: parazoa (no true tissues) eumetazoa (true tissues)
4 evolutionary brand points: 2:symmetry a-asymmetry b-radial-comes from a point (like jellyfish) 1.diploblastic (ectoderm & endoderm) c-bilateral (top&bottom, right&left, head&tail) 1.triploblastic- (ectoderm, mesoderm, endoderm) 2.cephalization-sensory equipment toward anterior
4 evolutionary brand points: 3: body cavities a.acoelom (no body cavity) b.pseudocoelom (cavity not completely lined by embryonic mesoderm) c.coelom (cavity completely lined by mesoderm)
4 evolutionary brand points: 4:coelom development blastopore formation a.protostome 1. spiral cleavage, determinate 2.mouth develops from blastopore b.deuterostome develpoment 1.radial cleavage, indeterminate 2.anus develops from blastopore
First animals 565-550 mya, macroscopic fossils called edicarcan biota (hills of australia) -other continents too
Paleozoic era 542-251 mya, cambrian explosion, relatives of many extinct phyla *What caused this? -predator-prey -atmospheric changes -hox genes
Created by: dixxfranks
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