The discovery has been made in the new science known as "epigenetics", which strongly suggests chemical damage is causing abnormal sperm and male infertility via a pregnant woman's exposure to contaminants, passing infertility not only to her son but successive sons - overturning old assumptions about biology and DNA.Until recently, it had been assumed a gene had to be mutated for a disease to be inherited. But studies on pregnant rats exposed to pesticides show male offspring can inherit reproductive disorders, and pass them on to their children and grandchildren, through an abnormality that affects the activity of genes but leaves the sequence of the DNA code unchanged.
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