According to the Genetic and Rare Diseases Information Center, Tay-Sachs is inherited if you have two carrier parents ("Tay-Sachs Disease"). Tay-Sachs can also be inherited if you have one carrier parent and one homozygous recessive parent. In the general population, one in every 250 people are Tay-Sachs carriers. This means that the chance of someone having a Tay-Sachs child isn’t that unlikely. Due to this genetic inheritance, Tay-Sachs can be considered somewhat common.
According to the National Tay-Sachs & Allied Diseases Association of Delaware Valley, the Tay-Sachs carrier gene can be found in 1 in 27 Jews. The carrier gene is found in 1 in 50 Irish-Americans. If both parents were carriers, there would be a 25% chance of a child having Tay-Sachs. I believe that this makes this disease more common in Jewish-American households. Although, Jews are most commonly inflicted, French-Canadians have about the same chance of having Tay-Sachs as Jewish-Americans. This means that, although it’s not incredibly common, it is still common enough that you may know someone who lost a child/currently has a child with Tay-Sachs (''Tay-Sachs Disease'').
According to the National Tay-Sachs & Allied Diseases Association of Delaware Valley, the Tay-Sachs carrier gene can be found in 1 in 27 Jews. The carrier gene is found in 1 in 50 Irish-Americans. If both parents were carriers, there would be a 25% chance of a child having Tay-Sachs. I believe that this makes this disease more common in Jewish-American households. Although, Jews are most commonly inflicted, French-Canadians have about the same chance of having Tay-Sachs as Jewish-Americans. This means that, although it’s not incredibly common, it is still common enough that you may know someone who lost a child/currently has a child with Tay-Sachs (''Tay-Sachs Disease'').