Once you go back 4 generations or so, the chance of inheriting no genes at all from a particular ancestor becomes quite high. The other interesting scientific

Once you go back 4 generations or so, the chance of inheriting no genes at all from a particular ancestor becomes quite high. The other interesting scientific result I've read is that there's more genetic variation within the traditional "races" than between them. I put "races" in quotations at this point because the whole concept is somewhat meaningless. There are certain genes that are more common in different groups. But if I understand it correctly, you'll be able to find people from a different "race" who are more genetically similar to you than some people from your own "race".