Question

A new and effective antibiotic becomes widely used for a particular species of bacteria. After some time, an antibiotic–resistant strain of the bacteria becomes prevalent. Which mechanism explains this phenomenon?

The bacteria undergoes genetic drift, leading to formation of a new gene pool and thus evolving a new characteristic.
Although less common previously, the resistant strain becomes more prevalent due to natural selection.
The bacteria undergoes genetic flow, thus creating a new gene pool and evolving into a new species.

Answer 1

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Answer 2

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Answer 3

hints:
http://www.niaid.nih.gov/topics/antimicrobialresistance/understanding/pages/causes.aspx

Answer 4

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Answer 5

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Answer 6

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Answer 7

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Answer 8

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Answer 9

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Answer 10

sup