I did talk to my philosophy professor about graduate school and provided him with a CV and statement when I applied for that. I get the impression that he is very busy and I needed to push him a lot to submit the LOR for my graduate program on time. However, I don't have any other significant interactions with him like research, mentorship, etc. With the genetics prof, I had a brief 30 minute conversation with him about our spring breaks, but nothing more significant than that.
Do you think I should go ahead and ask the genetics prof for the LOR? Is a letter in which the prof just talks about how I did well in a difficult and highly interactive class okay, even if he doesn't know me well personally?
For the record, my LORs from research and my leadership position will likely be very strong.