Chordates part 1 - Chordates part 1 Chordates part 1...

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Chordates – part 1 Page 1 of 8 Chordates – part 1 Readings Chapter 34, pp 698 – 713 Self quiz questions 1, 2 & 3 1. Derived characteristics (Fig. 34.3) (a) Notochord (b) Dorsal hollow nerve cord (c) Post anal tail (d) Pharyngeal gill slits (e) Endostyle 2. Lancelets (Clade Cephalochoerdata) (a) Presence of chordate characteristics (b) Mostly sessile suspension feeders (c) Segmented muscles 3. Tunicates (Clade Urochordata) (a) Larva has all of the chordate characteristics (b) Dramatic metamorphosis & sessile adult (c) Genome sequenced
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Page 2 of 8 4. Early chordate evolution (a) Information from lancelets & tunicates Chordates to craniates & vertebrates 1. Hox gene duplication increased potential complexity (see Fig. 25.21) 2. Neural crest tissue form unique characteristics of craniates (a) Most of these structures are in the head region. 3. Hagfish are craniates (clade Myxini) (a) They have a small cartilaginous head, but no jaws or vertebrae. (b) They secrete copious quantities of slime. (c)
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Chordates part 1 - Chordates part 1 Chordates part 1...

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