Behe Flashcards
Irreducibly complex examples:
Mousetrap, clotting protein cascade, eukaryotic cilium, bacterial flagellum
Behe’s ID hypothesis:
The components of life are irreducibly complex
Behe’s 2 points
ID isn’t incompatible with evolution, or even not-Darwinian selection
Draws from Franklin Harold
“Selection fails to explain biochemical complexity, and ID points strongly to supernatural”. Well, any explanation of life has such philosophical or theological implications, says Behe
Issue of biological redundancy to Behe:
Redundancy in proteins only delay irreducibility, because they’re still essential
Behe counters Miller
Miller=each bit of a mousetrap has an independent use eg paperweight
Behe=then there’s no mousetrap. The spring may be reducible, but the trap system is not.
Blood-clotting cascade
20 discrete protein parts, to control timing, placement, and formation of clot. Each protein is controlled by another, so without any one the entire process would fail (irreducible)
Doolittle on clotting and Behe’s reply
D: if mice without two proteins for clotting are bred then they = normal mice
B: misread. Really 2 gene mice have same problems as 1 gene missing. Conclusion that gene duplication is not a panacea
McDonald on mousetraps:
McD: didn’t need so many parts. It’s intermediate with some ingenuity.
B: McD’s predecessors are conceptual, not physical. Cells don’t have the protein commands to configure the “trap” that way.
Behe on complexity as a sign of ID
In 1950, cell was simple. Now complexity increases dt. 50% proteins work in groups of more than five.