She is a boring instructor. She talks extremely slow and glances over important and complex material like we just understand it the first time we're exposed to it. I stopped going to lectures because there is no point. She just repeats everything on the slide verbatim. Make sure you do a lot of different kinds of practice problems. I felt like I understood the material rather well but ended up getting a 80 and 76 on midterm 1 and 2. Both above average. The reason being is that she tends to through in some tricky questions but still completely doable but I still misunderstood the question. MAKE SURE TO READ THE QUESTION CAREFULLY OR YOU MIGHT NOT ANSWER THE QUESTION SHE IS ASKING. The TA, Josh, is very helpful and I highly recommend you attend discussion (beside the fact that it's 100 points of your grade). If there is a better instructor teaching LS4 I suggest you take it with them. I did not like Chen at all, although I did felt like I learned a lot (probably just from doing a bunch of problems and reading the book and the TA).
Winter 2016 - I came in to the class expecting a decent challenge considering that my friends struggled with Dr. Pham in LS4. I found her book Interactive Genetics on eBay, and it was really helpful. Not only did it help me to understand the concepts, but it helped me understand how she thinks of these problems. The average on each exam (2 midterms and final) was about 70-75, but she gave out about 130 points of clickers when the clicker category was only 90 points. I got about 85 on both midterms and final and an A+ overall. I wish I had taken her for LS 3. I highly recommend Dr. Johnson.