" if you grow bugs in ampicillin broth a few times, you kill the ones that get killed by the drug, and the ones that somehow survive dont die. the ones that dont die have a different genetic structure than the ones that died. and you can take this stuff of life and stick it into a group of bugs that would ordinarily die and confer antibiotic resistance to them. The bugs in your gut do it every day"
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brainlessone...
That is an argument often cited as support for evolution, but it has nothing to do with evolution. The bacteria you refer to have not "evolved" at all, and are not only still bacteria, they are still the same type of bacteria. To support evolution, they would have to become a new species that is resistant to the antibiotic.
In the case you present, all you had was a bunch of bacteria that had different traits (like blonde hair or blue eyes), one of which was a resistance to the antibiotic. If all but those bacteria are killed off, then (depending on the dominance of the genes involved) most of the offspring would probably carry the same genes in their DNA and thereby have the same resistance.
Think about it.
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