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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.
Autosomal dominance is a pattern of inheritance characteristic of some genetic diseases. Autosomal means that the gene in question is located on one of the numbered, or non-sex, chromosomes. Dominant means that a single copy of the disease-associated mutation is enough to cause the disease.This is in contrast to a recessive disorder, where two copies of the mutation are needed to cause the disease. Huntington's disease is a common example of an autosomal dominant genetic disorder.utosomal means that the gene in question is located on one of the numbered, or non-sex, chromosomes. Dominant means that a single copy of the disease-associated mutation is enough to cause the disease. This is in contrast to a recessive disorder, where two copies of the mutation are needed to cause the disease.