Anywhere! There are many different inherited diseases, and each of them has different effects. Every single body part has some heritable condition that could affect it.
alcohol affects every organ in your body; that's if you have too much.
Hepatitis affects the liver in the body.
Asthma affects the lungs.
the liver
Lungs
it affects you emotionally and it affects your whole body mostly your heart so it can increase your chances of a heart attack at an earlier age
It affects the heart and all the joints in your body
Eye
It affects the kidney.
achohol affects almost every part of your body... your muscles your brain, your stomach... just about everything that can go wrong will go wrong, if you have to much alcohol
Anti-bodies
Cancers are of many kinds and can occur in almost any part of the body. While they involve mutations in normal cells, these mutations are not necessarily inherited, but can be caused by radiation -- even normal background radiation -- or by other causes. Genes. A+