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B. autosomal dominantAutosomal dominant is the best choice. About half of offspring are affected, and the disease may be transmitted by males or females. The disorder is extremely unlikely to be autosomal recessive, both because more than half of offspring are affected and because so many individuals from outside the family would have to be carriers of the disorder. The disorder is not mitochondrial, since males transmit the disease. It is not X-linked dominant, since males can transmit the disease to their sons. It is not X-linked recessive, because males can transmit the disease.

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