In the general population, 1 in 300 individuals is a carrier for Tay-Sachs disease, while 1 in 30 individuals of Ashkenazi Jew descent are carriers. Tay-Sachs also affects 1 in 30 individuals with French-Canadian ancestry, although two completely unique mutations are responsible for the Ashkenazi and French-Canadian mutations.
What are the chances of two individuals having a child with Tay-Sachs if the father is an Ashkenazi carrier and the mother is a French-Canadian carrier?