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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.
Inheritance of a specific disease, condition, or trait depends on the type of chromosome affected (autosomal or sex chromosome) whether the trait is is dominant or recessive. A single, abnormal gene on one of the first 22 non-sex chromosomes from either parent can cause autosomal disorder.Dominant inheritance means an abnormal gene from one parent is capable of causing disease even though the matching gene from the other parent is normal.The abnormal gene dominates the pair of genes. single, abnormal gene on one of the first 22 non-sex chromosomes from either parent can cause autosomal disorder. Dominant inheritance means an abnormal gene from one parent is capable of causing disease even though the matching gene from the other parent is normal. The abnormal gene dominates the pair of genes.