Okuma Anlama Sorusu #11479

For decades following the discovery of the DNA double helix, biological dogma dictated that an organism's hereditary destiny was rigidly determined by its static genetic code. However, the burgeoning discipline of epigenetics has upended this deterministic paradigm. Epigenetics investigates heritable changes in gene expression that do not involve alterations to the underlying DNA sequence. Instead, chemical modifications—such as DNA methylation and histone acetylation—act as molecular switches, turning specific genes on or off in response to environmental stimuli. Factors including nutritional intake, chronic psychosocial stress, exposure to airborne pollutants, and physical exercise can leave lasting epigenetic marks. Remarkably, recent mammalian research suggests that certain environmentally induced epigenetic alterations can be transmitted across generations, implying that the lifestyle choices of ancestors may influence the metabolic and psychological health of their descendants.