One of the most helpful tools I have used used in my teaching of genetics is this progress graph. Students self-assess using this basic bar graph template and designate what percentage they believe they know each kind of genetics problem (I ask students to rate themselves at 100% if they know the content so well they could ace a test or quiz, but 110% if they know the content so well they can teach a peer). As students update their progress graphs, I see who has rated themselves at "110%" and often pair that student with another who is struggling. This progress graph is a great tool for encouraging collaboration and also helping students see their learning as a process. They can add to (or cross out) their percentages as they learn! The download includes a word template so you can swap out the kinds of problems students tackle.