A woman and a man have approached you for genetic counseling and are concerned about a hereditary form of deafness in their family. Both have normal hearing, and there are no children. The woman's father has autosomal dominant sensorineural deafness. Assume he is heterozygous. This hearing impairment displays onset at about age 10, and penetrance appears to be about 70%. There is no family history of deafness among the man's relatives. What is the probability that the woman is a carrier of the deafness allele?
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