Final answer:
Blood groups other than ABO and Rh are not typically associated with transfusion reactions but are useful for research and legal purposes.
Step-by-step explanation:
The statement that is incorrect regarding blood groups other than ABO and Rh is: They frequently cause transfusion reactions. Blood groups other than ABO and Rh are not typically associated with transfusion reactions. Instead, they are useful for research in population genetics, anthropology, as well as for legal purposes such as paternity and criminal cases.