Paragraftan ÇıkarımSoru #10763
Epigenetics and Gene Expression
For decades, the central dogma of genetics presumed that an organism's physical and physiological traits were rigidly dictated by the nucleotide sequence encoded in its genome. However, the burgeoning discipline of epigenetics has revealed a vastly more dynamic reality. Epigenetic mechanisms—such as DNA methylation and histone modification—act as biochemical switches that regulate gene expression without altering the underlying genetic code. Environmental influences, including chronic nutritional deficits, psychological trauma, and toxic chemical exposures, can induce methyl groups to bind to specific promoter regions, effectively silencing adjacent genes. Remarkably, some of these epigenetic marks can be preserved during cell division and even passed down across generations, a phenomenon termed transgenerational epigenetic inheritance. Consequently, an individual's health trajectory is shaped not merely by inherited inherited genes, but by the continuous molecular interplay between genome and lifestyle. It can be inferred from the passage that transgenerational epigenetic inheritance implies that ----.
- A)lifestyle stress or poor nutrition experienced by parents can physiologically impact the health of their future offspring
- B)offspring will always have identical physical appearances to their grandparents
- C)genetic sequence mutations never play any role in biological disease
- D)environmental factors can rewrite the genetic code within minutes
- E)human evolution has completely ceased in modern industrial societies
Cevabı ve çözümü göster
Doğru cevap: A) lifestyle stress or poor nutrition experienced by parents can physiologically impact the health of their future offspring
Çözüm: Kuşaklararası epigenetik aktarım, ebeveynlerin yaşadığı travma ve beslenme koşullarının epigenetik izler yoluyla sonraki nesilleri etkileyebileceğini gösterir. Doğru cevap A'dır.