list course on resume if I did poorly on it?

Also, do not put your grades for courses you list under the related coursework. That's what the Overall / Major / Relevant GPA line is for.

Is it common for interviewers to ask what grades I received in each course I list under Relevant Courses?

I've had it happen maybe once or twice when I was interviewing, but no it's not too common. In most cases, if they want to know how proficient you are in the subject, they'll ask you technical questions to gauge your grasp on the subject. For the most part, they'll assume your listed GPA is indicative of how you would have performed in the relevant classes as well. There's usually not enough time or enough interest to go through your resume class by class.

You should be fine, and it probably won't be all that emphasized during the actual interview process. I can't recall a time when a banker grilled me specfically about the grades I received in my different business and non-business classes. The only time I had to give a banker a specific grade was after they asked me what my least favorite/most difficult class was during my college career. In this case, I would make sure to list a class that's less relevant to banking than financial accounting, i.e. art history or english literature. Any interviewer will see your major and cumulative GPA on your resume, and assuming this number is high enough (3.5 or above), they will almost certainly spend a majority of their time evaluating your interest in banking, communication skills, etc.

A few of the banks that I interviewed at this fall requested that I bring an "unofficial" resume with me to the superday. In almost all of these cases, my transcript was handed directly to a recruiter at the beginning or end of the superday and was kept for official records. Interviewers did not have my transcript in front of them during interviews. Needless to say, given that you already were invited to the interview, this is primarily to check that you don't have a discplinary record and the information on your resume is accurate.

One MM firm I interviewed with during FT actually asked me to e-mail an unofficial transcript to the IB analyst recruiter a couple of days before my superday. The recruiter happened to be one of my many interviewers that day. At the beginning of the interview with her, she took it out and asked me questions about a few classes where my grades weren't up to par with the rest. Granted that these grades were from freshman year like yours, I gave a quick explanation about adjusting to college and being overcommitted and the interviewer moved on from there.