Evolution is an upper level science course. If the class applies as an elective to your major, personally, I would do it. If it's a financial burden, do not do it. But, if finances are not an issue, challenge yourself, take the class. Go a little out of your comfort zone to accomplish something, this time NOT for the sake of medical school. Don't make your academic career about how good things will look to admissions committees. "Yeah, I didn't do a minor because it wouldn't show up on my AMCAS." That actually sounds pretty dumb. So what if it shows up on your AMCAS? Do it for yourself, not to impress anyone.
Is this class guaranteed to make an impact on my application? Nope. That's not why I did it.
tl;dr Stop box checking. Stop worrying about how things "look" on your application.