Okuma AnlamaSoru #11478
Epigenetics: Beyond the Genetic Code
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. It can be inferred from the passage that transgenerational epigenetic inheritance suggests ----.
- A)children inherit only the lifestyle memories of their ancestors and no biological traits
- B)genetic codes mutate completely each time an organism reproduces
- C)an individual's health may be partially shaped by the environmental experiences of their parents or grandparents
- D)exercise and healthy eating are incapable of altering personal gene regulation
- E)DNA methylation is entirely absent in human physiological systems
Cevabı ve çözümü göster
Doğru cevap: C) an individual's health may be partially shaped by the environmental experiences of their parents or grandparents
Çözüm: Son cümlede ataların yaşam tarzı ve çevresel maruziyetlerinin torunların metabolik ve psikolojik sağlığını etkileyebileceği çıkarılmaktadır. Doğru cevap C'dir.