The mutation that leads to Tay-Sachs disease is recessive. Therefore, if a child's parents both carry the recessive Tay-Sachs allele, the probability that the child will develop Tay-Sachs disease is:

A) 100 percent.
B) 50 percent.
C) 25 percent.
D) 75 percent.

Tay-Sachs Disease

A genetic disorder caused by a deficiency of a specific enzyme, leading to the accumulation of fats in nerve cells, resulting in progressive neurodegeneration.

Recessive Allele

A variant of a gene that must be inherited from both parents to be expressed in the offspring's phenotype.