Can the air your parents and grandparents breathed, the food they ate, even the things they saw directly affect you decades later, despite your never having experienced these things yourself?
Epigenetics says, yes!
At the heart of this new field is a simple but contentious idea: your genes are triggered to express differently, depending on your environment and your actions during your lifetime. These genetic expressions could, in turn affect your grandchildren.
This documentary, 'The Ghost in Your Genes,' says biology stands on the brink of a shift in the understanding of inheritance.