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Tay-Sachs disease An inherited condition characterized by the absence of a single lysosomal enzyme called Hex A, which normally breaks down a membrane glycolipid called ganglioside G_M2 that is especially prevalent in nerve cells; usually occurs in children of Ashkenazi (eastern European Jewish) descent and is characterized by seizures and muscle rigidity.
A Mendelian trait is one that is controlled by a single locus in an inheritance pattern. In such cases, a mutation in a single gene can cause a disease that is inherited according to Mendel's laws. Examples include sickle-cell anemia, Tay-Sachs disease, cystic fibrosis and xeroderma pigmentosa.