Hey,
When I use my lesser genetic mutators nothing happens, as in neither a carried nor visible gene is added to the pet. It still consumes the mutator though. :< This has happened to me every time I've tried to use one in the past two weeks. I was wondering, is this a glitch, and is anyone else having this problem?

Are the pets tested? Carried genes don't show up unless you have a pet tested, even if they've been mutated. However, carried genes can still be passed down to offspring even though you don't know they're there, so sometimes you can find out through test breeding. Alternatively, you can get your pet genetically tested (by either buying your own genetic tester, or some people will test pets for you for a small fee)