I would suggest taking MIT's Secret of Life course on EdX. Its taught by Eric Lander who was a key figure in the human genome project and was a mathematician be

I would suggest taking MIT's Secret of Life course on EdX. Its taught by Eric Lander who was a key figure in the human genome project and was a mathematician beforehand, so he follows an axiomatic approach that is much different than the way other schools teach biology https://www.edx.org/course/introduction-to-biology-the-secret-of-life-3 https://www.edx.org/course/introduction-to-biology-the-secre... Alternatively, Harvard Extension School has some great biology courses you can sign up and get credit for. Though those are mostly for pre-med career changers