I disagree with eteshoe.
This is a non-issue. I had a BA FWIW.
Nobody really cares what courses you take with your science major unless you go to extremes (part-time schedule, lots of odd/irrelevant courses).
I think an undergrad thesis is a waste of time. What you need to be doing is getting more hands on lab experience. Ideally, you can put out first author peer-reviewed work from the lab.