In class, we will have a more conversational discussion of the principles of genomics, DNA, RNA, genes, and so forth. However, the following are a wealth of resources that will guide the discussion.
Dr. Ben Langmead, of Johns Hopkins University, provides a wonderful set of slides with an introduction to genomics
The Genome News Network (yes, there is such a thing), provides an oustanding set of resources, such as What's a (Genome|Chromosome|Gene|DNA|Genome Sequencing|Genome Map)?
Like videos? Khan Academy has a bunch.