Ben and Elise are pregnant with their 3rd child. The two prior pregnancies resulted in healthy boys but they are still concerned because Elise's first cousin was just diagnosed with DMD (Duchene muscular dystrophy – x-linked). Ben has three healthy brothers and no aunts or uncles. Elise has two healthy brothers and only the one maternal aunt with the son with DMD. What is the chance that Ben and Elise will have a child with DMD?   a.1/20   b.1/140

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