The modification of an organism's genome is known as molecular genetics (MG). The term molecular genetics can refer to a fundamental theory alleging that genes control all life processes by producing polypeptides, a more modest basic theory about gene expression and regulation at the molecular level, or an investigative approach used throughout biomedical science that is based on investigative strategies grounded in the basic theory about genes. Molecular genetics makes use of molecular biology's laboratory methods to link changes in the structure and sequence of human genes to functional changes in protein function, and so to health and disease. Many researchers have felt a strong personal responsibility to deliver mutation analyses for diagnosis, carrier detection, and even prenatal diagnosis to the families who have participated in their studies. Genetic testing for rare disorders can be done in a cost-effective manner and is a realistic option for clinical laboratories, according to research.