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5- is there a test for Tay-Sachs disease?
A simple blood test can identify it.

6- what are the chances that your child will have Tay-Sachs?
If both parents carry the gene, there is a 50% chance that in each pregnancy that the child will receive the changed gene and be a carrier.

7- what happens to the cells to cause Tay-Sachs?
They are suffocated by fatty acids that are usually broken down by enzymes p, but Tay-Sachs prevent the production of these enzymes.

8- how did Tay-Sachs gets it's name?
Tay-Sachs was names after warren Tay and Bernard Sachs.