The field of epigenetics now tells us that genes are only a part of the story. We are born with DNA that can be later altered through our life experiences and interactions with the environment. Certain genes can be activated or deactivated by molecular process, one of which is methylation. Epigenetic researchers are not only finding that life experiences can turn off genetic expression via methylation, but that this patten of methylation can in fact be passed down through generations.
