0% 25% 50% 75%
I gave my students this multiple choice question: Tay-Sachs disease is a recessive genetic disorder. If only one gene is present, an individual is a carrier. What is the probability of two healthy Tay-Sachs carriers having a child that has the disease?

Only one answer is correct among these 4 choices:
- 0%
- 25%
- 50%
- 75%

Could you tell me which one is correct?

25%