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.

Question

Quizplus · Accepted Answer

If both parents are carriers of the recessive Tay-Sachs allele, there is a 25% chance that the child will inherit two recessive alleles (one from each parent) and develop the disease.

The Mutation That Leads to Tay-Sachs Disease Is Recessive