London: Genes chemically silenced by stress during life remain silenced in eggs and sperm, allowing the effect to be passed down to the next generation, researchers say.Obtained from detailed DNA scans in developing mouse eggs and sperm, the finding backs up mounting indirect proof from statistical studies that the genetic impacts of environmental factors like smoking, diet, stressed childhoods, famine and psychiatric disease can be passed down to future generations through a process called epigenetic inheritance.Many geneticists had considered this impossible.
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