I've read In The Presence of Mine Enemies by Harry Turtledove. It's more of a military fiction but it's basically about the US staying out of WWII and Germany winning the war. Jews are forced to go into hiding or act as if they aren't. The book focuses on the Jewish families and what they go through, because if the government finds out, they will be eliminated.
Hope that helps at least a little bit.
Thanks! I'll take a gander, but it sounds like there isn't so much in terms of DNA. Looking more for interaction between DNA testing/engineering and
the military. Appreciate it though, thanks!