thinking about turtles evolution part 1 how the turtle gets its shell n.
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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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unique development
Unique Development

Expanding edge of the carapacial ridge.

A. Entire embryo in cross-section. B. Enlargement.

formation of bone in turtle shell
Formation of Bonein Turtle Shell

Endochondral

Intramembranous

Advantages of Metamerism (repeating body segments)

slide5
Microeveolution by Speciation (Darwin)Macroevolution = Whole New Body Plans (like turtles)Revision of Text Analogy

Problems with transitional forms in nature

Microevolution vs Macroevolution

real world example of gene regulation in prokaryote e coli
Real world example of Gene Regulation in Prokaryote (E. coli)

Generalize to molecules from adjacent cells serving as signals

unique development1
Unique Development

Expanding edge of the carapacial ridge.

A. Entire embryo in cross-section. B. Enlargement.

embryonic limb buds
Embryonic Limb Buds

Normal

Mutated