O
o_mlly
Guest
You have just left the reasonable conclusion of experimental science and lept into mythology of evolution.They might have evolved resistance in response to exposure to something in nature that was similar to penicillin.
Did you read the experiment methodology? That is exactly what Lederberg sought to prove via experiment. In doing so, Lederberg also demonstrated that the penicillin resistant genes were always present in the bacterial gene pool. Lederberg’s experiment is experimental data supporting the presence of a large and fixed gene pool.Also the mutation needed is small enough that the probability of it appearing randomly is reasonable.
Actually, this experiment supports evolution more that not. It has always been the premise that genetic variation exist, and this just shows that premise is true. From the very first line of your citation:
Evolution (macroevolution) requires an expansion of the gene pool, the addition of new genes (with new information for new traits as life is supposed to move from simple beginnings to ever more varied and complex forms (“molecules to man” or “fish to philosopher”). However, Lederberg experiment negates that notion. From the article cited:In 1952, Esther and Joshua Lederberg performed an experiment that helped to show that many mutations are random, not directed.
Esther and Joshua Lederberg determined that many of these mutations for antibiotic resistance existed in the population even before the population was exposed to the antibiotic — and that exposure to the antibiotic did not cause those new resistant mutants to appear.