I made some bacteria glow this semester by introducing the GFP gene into it. It was the wrong strain or bacteria according to my professor. Either way they glowed

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I have also done this in microbiology lab in college. you splice a gene into a culture, do a plate streak, and the resulting colonies of bacteria become florescent undr blacklights
it is actually widely used technique used my microbiologist as this gene(in conjunction with another "useful" gene-for,say,something like insulin production) can quickly and esily be recognized in a colony of bacteria. if you are tying to make the bacteria make something useful, the easiest way is to "tie" this gene to the florescent gene. if the resulting colonies "glow" then the bacteria contains the "useful" gene and will be able to make that particular substance.
fish (and now i guess frogs) are just a more complex orgnaism. same process,same result. and this wasn not developed out of cruelty or even for the fishtrade at all. scientists are trying this tecnique for "higher" organisms for certain gene therapies for differing diseases/conditions. if someday we humans benefit youll be thankful for those glow fish (i just dont "like" those particular fish). and it is not bad like, say, the cosmetic industry, who use lab animals for testing the products, with sometimes horrific consequences.
nothing wrond at all with it, just not my cup of tea.
just my 2 cents
cheers!