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.
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An echocardiogram can also detect inheritable conditions such as cardiomyopathy and mitral valve prolapse.
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Marfan syndrome is one of the more common inheritable disorders.
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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.