How is trauma passed down through the generations?

It’s well known that children of trauma survivors often experience secondary trauma– a kind of stress reaction that is ‘caught’ by someone, simply by hearing about the original trauma.  A substantial amount of literature, for example, has been written that examined Second Generation Holocaust Survivors.  The children of Holocaust survivors often went on to have a unique constellation that seemed to be related to their parents’ trauma. Recent research suggests that our DNA may actually store our memories, and pass them down to our children.  Who knows– perhaps Jung was correct when he postulated a collective unconscious.DNA transmits memories through generations