How do I go about a DNA to find out whether or not I am from Jewish background?
Family Tree DNA can test for Jewish ancestry. You can look here: http://www.ancestry-dna.com/JewishDNA.ht… You wont be able to find out about your male ancestry without a male in your fathers line submitting a sample. If there is Jewish ancestry in your female line, you can find it. They only used to be able to test for Cohanim factor but I see they are now also testing Levite, Sephardic, and Ashkenazi. They also give you a web page with your markers and as research progresses you keep finding out more about your ancestry. You will find genetic “cousins” and where you come from in the dim and distant past as well.