Lecture 8 - Chapter 24, Section 3 - Macroevolution

Lecture 8 - Chapter 24, Section 3 - Macroevolution - Many...

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1 Macroevolution* (Ch. 24.3 and R2) *evolutionary change at or above the species level 2 Many believe in microevolution but not macroevolution (e.g. Michael Behe, The Edge of Evolution, 2007) 3 Critique of macroevolution: irreducible complexity http://udel.edu/~mcdonald/mousetrap.html Standard 5 part mouse trap Some things are too complex to be random. If one part not there, then machine doesn’t work Rebuttal: Pieces of complex systems often have functions of their own 2 part mouse trap 4 Ex 1) Bacterial flagellum made of parts that could serve other functions Similar to needle-like structures used to inject toxins Orgel’s second rule: Evolution is cleverer than you are.
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Complex camera-type eye Pinhole camera-type eye Eye with primitive lens Patch of pigmented cells Eyecup Pigmented cells (photoreceptors) Epithelium Nerve fibers Fluid-filled cavity Epithelium Pigmented layer (retina) Optic nerve Pigmented cells Nerve fibers Cornea Cellular fluid (lens) Optic nerve Cornea Lens Optic nerve Retina Ex 2) Eyes with a range of complexity still function Complex camera-type eye Pinhole camera-type eye Eye with primitive lens Patch of pigmented cells Eyecup Pigmented cells (photoreceptors) Epithelium Nerve fibers Fluid-filled cavity Epithelium Pigmented layer (retina) Optic nerve Pigmented cells Nerve fibers Cornea Cellular fluid (lens) Optic nerve Cornea Lens Optic nerve Retina 6 Critique of macroevolution: punctuated equilibrium not explained by Darwinian theory Standard 5 part mouse trap
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This note was uploaded on 10/03/2009 for the course BISC 120 at USC.

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Lecture 8 - Chapter 24, Section 3 - Macroevolution - Many...

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