Thursday, August 29, 2013
Indirect Routes and Exaptation
8) Professor Behe excludes, by definition, the possibility that a precursor to the bacterial flagellum functioned not as a rotary motor, but in some other way, for example as a secretory system. (19:88-95 (Behe)).
University of Rochester evolutionary biologist H. Alan Orr agrees that indirect evolution is unlikely:
There is no strict logical barrier to a Darwinian precursor to a bacterial flagellum having functioned as a secretory system and then, by dint of random mutation and natural selection, turning into a rotary device. There is also no absolute logical barrier to it having functioned as, say, a structural component of the cell, a light-harvesting machine, a nuclear reactor, a space ship, or, as Kenneth Miller has suggested, a paper weight. But none of these has anything to do with its function as a rotary motor, and so none of them explain that actual ability of the flagellum.
- See more at: http://www.evolutionnews.org/2012/08/did_michael_beh063271.html#sthash.fpmfrfy5.dpuf