Autosomal diseases spread in normal inheritance pattern. Here the allele is dominant and so the pattern will be normal inheritance. When the male has dentinogenesis imperfecta but the mother has a normal teeth, probably the father of the male had inherited the dominant allele and has been passed on to him. He marries a woman with normal teeth and bears 4 children.
The probability therefore the first child will be a male is 0.5 and the male will have dentinogenesis imperfecta is 0.5. Together the probability is 0.25.
Similarly the probability that 3 of the 4 children will have this disease will be 0.5 for every child.
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