Advances in molecular and cellular biology have led to an in-depth understanding of the basic mechanisms of life and disease. Elucidation of principles of genetic information storage in DNA, transcription of this information into RNA, and translation of RNA into proteins have led to an exponential growth of techniques useful for screening, diagnosis, prognostication, and treatment. In a wide range of medical and surgical specialties, many of these techniques are already standard of care and are used daily. In an emerging model of precision medicine, data from DNA and RNA of an individual patient will be used to guide their care. While much progress has been made, our understanding of majority of surgical diseases is incomplete. An academic surgeon with a career of scientific pursuit must have a thorough understanding of the current state of laboratory techniques for DNA and RNA and of the knowledge gaps that future investigations should address. This chapter reviews the basics of genetic, genomic, and transcriptomic analyses.