A fascinating character and an extremely patient experimenter, Mendel was a German friar and scientist who figured out that plants (and presumably animals) had inheritable characteristics.
An echocardiogram can also detect inheritable conditions such as cardiomyopathy and mitral valve prolapse.
Marfan syndrome is one of the more common inheritable disorders.
The blood of the tenant becoming corrupt by attainder was decreed no longer inheritable, and the effect was the same as if the tenant had died without heirs.