Comment by Jensson
3 years ago
Yes, but that doesn't mean people will take you seriously.
In order to evolve such a system all you need is for the separate components to be useful. A cell laying still and multiplying is useful enough, so that is the baseline. Then adding a flagella to move randomly so it can move away from its waste product and keep hitting new nutrients is also useful. From there it can start to detect waste and move when it is near waste and stop moving when it is near food. Then yo just continue such steps, not very hard to imagine compared to imagining macro evolution.
But doesn't that reduce to a point where something useful becomes from separate useless components?
In your case, why would a flagella be useful if it's not propelling something? A flagella is only useful as a component of something, but not by itself.
Flagella only exist as components of something, they do not need to and shouldn't exist by themselves. If flagella spontaneously popped into existence and cells picked them up, that would be quite difficult to explain without design, but cells producing flagella because they are useful components makes perfect sense on its own.
I think he's saying, random mutation wouldn't produce all required components at once. One mutation gives you a bit of a flagella, another gives you bit of a nose, but how does the flagella mutation survive to coexist with the nose mutation that makes it useful.
I suspect the answer is that having flagella without a nose is still better than having no flagella. If so it suggests evolution isn't good at accessing groups of mutations that aren't individually beneficial.
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> cells producing flagella because they are useful components makes perfect sense on its own.
But that's the thing, this sort of implies that a complete flagellum can be spontaneously produced because it's useful, which sort of collides with the parent comment on systems evolving by combining previously useful components.
Flagella aren't useful until they are complete. So intermediate forms should be lost, right?
Would this leave us in a scenario where a single combination of several mutations at the same time suddenly gives you a complete, functional flagellum?