1. Huntington’s disease is a dominant allele (not sex linked) that usually does not manifest itself until after age thirty- five. Individual who have the disease are almost always heterozygous. As a genetics counselor, you are visited by a 23-year-old woman. Her mother has Huntigton’s, but her father is normal. Use alphabets when required. a. What is the genotype of the mother?

b. What is the genotype of the father?

c. What is the probability that this woman will develop Huntington’s disease as she grows older ?