The UK Biobank definitely has a bias, but it's in the opposite direction to that you are suggesting here. It's primarily healthy people who are enrolled only wh

The UK Biobank definitely has a bias, but it's in the opposite direction to that you are suggesting here. It's primarily healthy people who are enrolled only when they reach the age of 40 and still have no significant health problems. So, if you are in the UK Biobank, you are less likely to have had a genetic disease stemming from incest.