Jono wrote:
PLA wrote:
The flagellum is irreducibly complex only in the sense that a cheese sandwich is irreducibly complex.
I. e. it would cease to function as a cheese sandwich if the cheese were removed from it.
For those of you who can't access that article I cited (I can't access it either). The bacterial flagellum probably evolved from the Type III secretion system that some harmful bacteria use to inject toxins into living cells. It is made up of a simpler subset of components of the flagellum and is still functional. Hence, the flagellum is not irreducibly complex.
That is certainly one possibility. Of course, right now we don't have a clear understanding of how the bacterial flagellum actually works in its present state, so debating its evolutionary path may be a bit premature.
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