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Thinking about Turtles & Evolution Part 1: How the Turtle Gets its Shell 1.

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Presentation on theme: "Thinking about Turtles & Evolution Part 1: How the Turtle Gets its Shell 1."— Presentation transcript:

1 Thinking about Turtles & Evolution Part 1: How the Turtle Gets its Shell 1

2 Strange Anatomy 2

3 Unique Development Expanding edge of the carapacial ridge. A. Entire embryo in cross-section. B. Enlargement. 3

4 Formation of Bone in Turtle Shell 4 Advantages of Metamerism (repeating body segments) Endochondral Intramembranous

5 Microeveolution by Speciation (Darwin) Macroevolution = Whole New Body Plans (like turtles) Revision of Text Analogy Problems with transitional forms in nature 5 Microevolution vs Macroevolution

6 Uniramous & Biramous Appendages Mutation and Specilization 6

7 Gene Regulation: On/Off Switches 7

8 Real world example of Gene Regulation in Prokaryote (E. coli) 8 Generalize to molecules from adjacent cells serving as signals

9 Unique Development Expanding edge of the carapacial ridge. A. Entire embryo in cross-section. B. Enlargement. 9

10 Fruit Fly Drosophila melanogaster Larva (maggot) Adult 10

11 Embryonic Limb Buds Normal Mutated 11

12 12


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