Huntington Disease Is an Autosomal Dominant Disorder That Leads to Progressive

Multiple Choice

Huntington disease is an autosomal dominant disorder that leads to progressive degeneration of brain cells.There is no effective treatment for the disorder and individuals usually die 10 to 15 years after the onset of symptoms.Which of these statements about Huntington disease is true?

A) As an autosomal dominant disease, Huntington disease is expressed only if both parents carry the trait.
B) Huntington disease usually skips a generation.
C) Huntington disease can only be inherited when a parent is showing the trait.
D) Huntington disease usually appears during middle age.
E) Huntington disease is caused by a defect in the elastic connective tissue protein.