My anatomy group had people who refused to come in after hours since there was no grade for the quality of dissection and they spent their time studying for the exam instead, leaving the rest of us to do their work. When there’s no oversight for this kind of behavior, how have you dealt with group members who slack off or just don’t car
So I'm a career-changer post-bacc and I can tell you that this is a great lesson for you. A large portion of your career day-in and day-out will involve compensating for slack. It's not necessarily b/c people don't give a crap, although that is sometimes the case, but more so b/c people are autonomous and prioritize differently. This is why being a leader is SO dang difficult.
In these situations, I tend to do a few things before just sucking it up.
1) I tend to just chat with the people and offer empathy in the form of "I understand this stuff is getting in the way of studying - I know I have a ton I need to catch-up on. If we could all just quickly sit down and crank this out, we can get to what's more important. Appreciate the help!". Even if only ONE of them decides to step up, then you've improved the situation and don't come off elitist. It's good practice to learn how to "sell" a situation and choose words wisely. You may be a "pre-med" (a term I've never liked b/c it promotes unjustified entitlement ha), but it's important to always conduct yourself like the professional you want to become. Now if they decide to not help, then:
2) You move on and crank out the work. The pro here is learning how to self-sustain. People won't always be there in difficult situations, so use it as a learning experience to walk away from an inconvenience and get the job done and done WELL. One thing you should remember is that professors [generally] know who is and isn't doing the work. When you have an answer to a question related to the assignment, it further validates this point. Now if these extra hours are merely for ensuring you submit quality work and is a personal desire, then you need to remember that you can't force your standard onto others. They aren't wrong for spending the extra time studying just as you aren't wrong for taking the extra hours to not study and focus on the dissection.
I know this may sound "grandiose" for a simple dissection assignment, but I ALWAYS hear undergrads go "I'm gonna leave their name off the assignment - screw them!" or "I'm gonna ream them out!" or "I'm gonna go chat with the professor and tell them they aren't doing s***". All of this is childish and PETTY, PETTY, PETTY. If you leave them off the assignment, then you're throwing someone under the bus and that's an AWFUL leadership decision that will only come to haunt you when you end up working together again in another class lol. Reaming them out only makes the reamer look terrible. Talking to the professor is only necessary under major circumstances and can be perceived as childish if not handled properly.
Sry for the long post lol, but I think there are some good learning opportunities here and want to see you do well!