Huntington's Disease Is a Fatal Syndrome Caused by a Mutation

question 5

Multiple Choice

Huntington's disease is a fatal syndrome caused by a mutation in the HD gene. The disease has an average age of onset of 35 and the majority of individuals that are affected are heterozygotes. What is the probability that a 25-year-old woman with no symptoms and who is the daughter of a man that has HD and a mother who does not will have a child that will have the mutant HD allele?

• A) 25%
• B) 50%
• C) 75%
• D) 100%

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