Question: Dentinogenesis imperfecta is a rare, autosomal, dominantly inherited disease of the teeth which occurs about one in 8,000. The teeth are somewhat brown in color and the crowns wear down rapidly. Assume that a male with dentinogenesis imperfecta and no family history of the disease, marries a woman with normal teeth. What is the probability that their first child will have dentinogenesis imperfecta?