Dentinogenesis imperfecta is a rare, autosomal, dominantly inherited disease of the teeth which occurs about one in 8000 (Witkop, 1957).  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:    (a) their first child will have dentinogenesis imperfecta? (b) their first two children will have dentinogenesis imperfecta? (c) their first child will be a girl with dentinogenesis imperfecta?

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