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8_Macroevolution

8_Macroevolution - Macroevolution(Ch 24.3 and...

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1 Macroevolution* (Ch. 24.3 and R2) *evolutionary change at or above the species level
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2 Many believe in microevolution but not macroevolution (e.g. Michael Behe, The Edge of Evolution, 2007) QuickTime ° and a H.264 decompressor are needed to see this picture.
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3 Critique of macroevolution: irreducible complexity Standard 5 part mouse trap
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4 Rebuttal: Pieces of complex systems often have functions of their own 2 part mouse trap http://udel.edu/~mcdonald/mousetrap.html
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5 Ex) 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) 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
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7 Critique of macroevolution: punctuated equilibrium not explained by Darwinian theory Standard 5 part mouse trap Gradualism Punctuated equilibrium
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8 Rebuttal
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