Evolution Unravels Itself in Front of Researcher's Eyes
E. coli bacteria mutate to metabolize citrate
Previous research has shown that wild-type E. coli can utilize citrate when oxygen levels are low.
Antibiotic resistance is a common one, and an easy example - that's why I mentioned it, and probably why others have mentioned it. But you don't recognize it. It's time to ask why not.dan said:Your detailed reply iceaura lacked any examples of step by step information increasing mutations found in the germ cells of any organism in any lab in the world
That's not a cost in their environment where there is no ribose. It's an economy. Shutting down the useless ribose machinery makes the bacterium a more streamlined glucose-eating-machine. This too, is evolution and of a type seen in blind crayfish.While the bacteria have adapted, it has come at a cost. For example, all the lines have lost the ability to catabolize ribose (a sugar).1
That's not what that article says.Some lines have lost the ability to repair DNA. 2
The article you offered suggests that E. Coli cannot metabolize citrate in the wild. However, this is not true. Previous research has shown that wild-type E. coli can utilize citrate when oxygen levels are low. 3
3. Klaas Pos, et al., “The Escherichia coil Citrate Carrier citT: A Member of a Novel Eubacterial Transporter Family Related to the 2-oxoglutarate/malate Translocator from Spinach Chloroplasts,” Journal of Bacteriology 180 no. 16 (1998): 4160–4165.
Which is why the lab work is an actual demonstration of evolution.E. coli is able to ferment citrate under anoxic conditions if a cosubstrate is available for reducing power (40). The only known barrier to aerobic growth on citrate is its inability to transport citrate under oxic conditions (41–43).
Though all populations have been fed with glucose, one of them suddenly mutated in order to metabolize citrate, which, usually, is of no use to E. coli bacteria. In fact, precisely because the E. coli is known to be unable to metabolize citrate, it's this inability that stands as one of the indicators used to identify it from other bacteria. Evolution had taken place right in front of Lenski's eyes.Evolution Unravels Itself in Front of Researcher's Eyes
E. coli bacteria mutate to metabolize citrate
Thank you Spidergoat for your valiant attempt at googling a solution to your problem. Unfortunately, your example falls short. No information was added. The bacteria simply adapted to their new surroundings. Some call this "adaptive evolution" (which in english means no evolution at all)
True evolution, molecules to man, requires new information being added
While these changes are beneficial (in the lab environment), they do not add information nor would they help them compete in the wild.
Finally, note that in your article it admits that the mutations involved have not been identified but only suggests it was a "chromosome inversion".
It says that all the populations were fed glucose, in which case why would a population evolve to metabolise citrate?
It would be selected against as a useless trait.
Aye Capn', that he does. The plank is ready!The writer sounds like a bit of a twit to me.
Now you quit that! You made me crack up. For a second there, I felt a common bond between us, and it makes it difficult to dislike you.This is a metaphor on creationism verse evolutionist on this thread.
Evolutionist: "Look here is a chair"
Creationist: "I don't see a chair"
Evolutionist: "What are you blind, look I'm sitting on it right now!"
Creationist: "no your not"
Evolutionist: "What?!? look I'm standing on the chair now, how could I possibly be above the ground unless I was standing on this chair?"
Creationist: "God's making you float in the air, that all."
True evolution requires new information being added