Question

3. A bacterial colony represents all the progeny of a single cell. We refer to a colony as a clone, because bacteria reproduce asexually so all of the daughter cells should be genetically identical. However, some bacteria that were sensitive to the antibiotic at the beginning of the experiment were resistant by the end. What naturally occurring event led to resistance? (Hint: We are working with pure cultures of laboratory strains, so there are no superbugs around sharing their genes for resistance.) 4. Did the presence of streptomycin in the gradient plates cause the bacteria to generate new genes for resistance? (circle your answer) No Yes Why or why not?

Answer 1

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Antibiotic resistance in the bacteria evolves naturally by the natural selection through random mutation (gt can also be engineered by applying an evolutionary stress on the bacterial population). Once such a mutated gene is generated then bacteria can transfer the genetic information in a horizonatal Fashion by plasmid Exchange. By the process of random mutation bacteria change in some way that eliminates or reduces the effectiveness of the drugs or chemicals. And bacteria will become resistant by the end.