Genetics is the scientific study of heredity, focusing on how traits are passed from one generation to the next. It examines the biological mechanisms underlying variation, which are encoded in the genome. Genetic material, primarily DNA, contains sequences of instructions that dictate the structure and function of organisms. These instructions are organized into genes, which control observable characteristics. The process of inheritance involves the replication and transfer of these genetic units during cellular division, ensuring that characteristic information is maintained across successive cell cycles and generations. Modern study involves analyzing chromosomes, mapping the location of these genes, and understanding the molecular processes of gene expression.