How does experiencing trauma affect a persons life?

In the following video, Dr. Rachel Yehuda studied the genetic effects in a population of Holocaust survivors and found variations from the norm in both generations for the gene associated with depression and anxiety disorders. The findings imply that children of individuals who experience profound stress in life may be more likely to develop stress or anxiety disorders themselves.

https://www.pbslearningmedia.org/resource/e9a3377e-ef0d-4815-8f25-166daa4d3114/can-trauma-be-passed-to-the-next-generation-through-dna/#.WZeOTNGQyM8

1. How does experiencing trauma affect a person’s life?
2. Describe the term epigenetics. How does stress play a role in epigenetics?
3. Describe an event in history that could have caused stress-related changes to the next generation (some examples include the Holocaust, 9-11 terrorist attack, the Dutch famine of 1944). Include the disorders these children experienced (such as anxiety, depression, mental disorders, etc).
4. Why might it be helpful to know how children will be affected by trauma their parents experienced?
5. What kinds of events going on in the world right now could be producing similar effects in future generations?