Dad’s Lifestyle Choices?
Germ cells are sperm and egg cells and their precursors. Mutations to a father’s germ cells caused by lifestyle choices (like smoking) are present in all the cells of his progeny. These mutations are also present in his children’s own germ cells. This means that a father’s lifestyle has the potential to affect the DNA of multiple generations and not just his immediate offspring.
The FASEB Journal, July 2013