Question

5. John, age 47, has just been diagnosed with Huntington’s disease, which is caused by a rare dominant allele. His daughter, age 25, has a 2-year-old son. No one else in the family has the disease. What is the probability that the daughter will develop the disease?

Answer 1

50%

Explanation:

John has Huntington's disease and it is given no one

else in the family has the disease i.e. probability of john getting the disease is

50% as no family member has the disease.

Similarly the Probability that the daughter will develop the disease is also 50% because it may pass on to it or not.