Is the disease a genetic or chromosomal?

Tay-Sachs disease is a genetic disorder passed down through families. A person with this disease lacks hexosaminidase A, which breaks down GM2. Without HEX-A. GM2 builds up in mostley in the brain cells causing major problems. Both parents must carry the gene to pass it on their child. The father and the mothers genotype must be Tt to have a child with Tay-Sachs disease.