Adoptees use DNA to find surname By Paul Rincon Science reporter, BBC News The tests read a number of genetic markers on the Y chromosome Male adoptees are using consumer DNA tests to predict the surnames carried by their biological fathers, the BBC has learned. They are using the fact that men who share a surname sometimes have genetic likenesses too. By searching DNA databases for other males with genetic markers matching their own, adoptees can check if these men also share a last name. This can provide the likely surname of an adoptee's biological father. The genetic similarities between...