Molecular genetics is the field of study that investigates the structure and function of genes at the molecular level. Synonyms for molecular genetics include molecular biology, genetics, genetic engineering, genomics, and gene manipulation. These terms all refer to the study of DNA, RNA, and proteins, and how they are involved in the development and function of an organism. Molecular genetics is a rapidly evolving field that has revolutionized modern medicine through the development of new treatments for genetic diseases and the discovery of new genetic mutations that cause disease. With the ability to manipulate genes on a molecular level, scientists are making unprecedented advances in understanding the mechanisms of inheritance and gene expression.