This video by a young Ph.D. candidate explains stuff about gene expression, and the last part of the short video talks about antibiotic resistance. It's only a few minutes long and I think it's worthwhile.

One definition you may need if it's been awhile since you took biology:

Quote:

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phenotype. (1) The physical appearance or biochemical characteristic of an organism as a result of the interaction of its genotype and the environment. (2) The expression of a particular trait, for example, skin color, height, behavior, etc., according to the individual's genetic makeup and environment.

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https://www.youtube.com/watch?v=LdlsapSk2-o&a...U3TXvAxnZA