Prevention of Tay–Sachs disease
For preventing Tay–Sachs disease, three main approaches have been used to prevent or reduce the incidence of Tay–Sachs disease in those who are at high risk: Prenatal diagnosis. If both parents are identified as carriers, prenatal genetic testing can determine whether the fetus has inherited a defective copy of the gene from both parents.
Source: Wikipedia — Prevention of Tay–Sachs disease (CC BY-SA 4.0)