Seems like you’d probably want to look at the course syllabus and compare it to the MCAT topic outlines.
N=1 and YMMV, but I took regular genetics after I’d taken the MCAT, and while it was fun and one of my favorite classes, I didn’t think it covered anything particularly helpful for the MCAT that wasn’t already covered in other classes. Maybe as a review for the material it might’ve been nice, but I think physiology or microbio or something would be more useful.