Single-gene disorders can also be described as monogenic disorders, which are caused by disruptions or abnormalities in a single gene. These genetic disorders are usually hereditary and can be passed on from one generation to another. Another synonym for single-gene disorder is Mendelian disorder, named after the Austrian monk Gregor Johann Mendel, who is known as the father of genetics. Mendelian disorders follow a clear pattern of inheritance, and may cause a wide range of medical conditions. Some single-gene disorders are also known as genetic diseases or hereditary diseases, as they can result in functional or structural abnormalities in various parts of the body.