Molecular genetics is a branch of genetics that focuses on the structure and function of genes at a molecular level. Researchers in this field study how genes are organized, replicated, and regulated within cells, as well as how genetic information is transmitted from one generation to the next. Molecular genetics also involves the study of genetic mutations and their effects on an organism's phenotype. This area of research is important for understanding the underlying mechanisms of genetic diseases, as well as for developing new treatments and therapies for genetic disorders.