Genes are the Subjects of Modern Mapping, which is the study of the structure and function of genes. Genes are the basic units of heredity and are made up of DNA. They are responsible for the transmission of traits from one generation to the next. Modern mapping techniques allow scientists to identify and analyze the genetic makeup of organisms, as well as to understand how genes interact with each other and the environment. This knowledge can be used to develop treatments for genetic diseases, improve crop yields, and create new medicines.