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

Thinking about Turtles & Evolution Part 1: How the Turtle Gets its Shell. Strange Anatomy. Unique Development. Expanding edge of the carapacial ridge. A. Entire embryo in cross-section. B. Enlargement. Formation of Bone in Turtle Shell. Endochondral Intramembranous.

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

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

  2. Strange Anatomy

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

  4. Formation of Bonein Turtle Shell Endochondral Intramembranous Advantages of Metamerism (repeating body segments)

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

  6. Uniramous &BiramousAppendagesMutation andSpecilization

  7. Gene Regulation: On/Off Switches

  8. Real world example of Gene Regulation in Prokaryote (E. coli) 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.

  10. Fruit Fly Drosophila melanogaster Larva (maggot) Adult

  11. Embryonic Limb Buds Normal Mutated

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