12-10vertebrates_Lecture 40

12-10vertebrates_Lecture 40 - Previously: Vertebrate...

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5/10/11 Vertebrate animals—animals with backbones Previously: features of Metazoa protist ancestors how animals compare to fungi sponges as early animals how Radiata & Bilateria differ, how protostomes differ from deuterostomes u s
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5/10/11 Chordate characteristics: 4 critical innovations 1. Notochord –Fibrous dorsal support rod 1. Dorsal hollow nerve cord –”upside down invertebrate” 3. Pharyngeal (gill) slits –water does not have to flow through digestive tract (feedingP gas exchange, etc.) 4. Postanal tail –swimming, etc.
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5/10/11 Lancelets & Tunicates represent early chordates (but are not vertebrates) Tunicates may be the closest living relatives of vertebrates, but they lost segmentation, while vertebrates did not.
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Craniates are chordates who’ve gotten a head: Cranium –anterior end of nerve cord forms a brain encased in protective cartilage or bone Neural crest –embryonic cells near developing neural tube disperse & help form skeleton, especially cranium, etc. Two
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This note was uploaded on 05/10/2011 for the course BIO 103 taught by Professor Geek during the Spring '11 term at Wisconsin.

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12-10vertebrates_Lecture 40 - Previously: Vertebrate...

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