Yes. If the parents have the potential to be carriers of the disease, they can have a child with the disease. To show you my logic, follow this. T is normal, but t is tay sachs. If the parents are Tt and Tt, they can have a 25% chance of a child having the illness.
C.
Explanation: A long term goal and a short term goal can both be achieved in the future, an unrealistic goal cannot be achieved at all. A realistic goal is the best answer.
