Huntington disease is caused by
A) the absence of a gene.
B) a gene found on the X chromosome.
C) two copies of a recessive allele.
D) the accumulation of a defective protein.
E) several defective genes.

Question

Quizplus · Accepted Answer

Huntington disease is caused by the accumulation of a defective protein called huntingtin, which damages and ultimately kills nerve cells in the brain. It is inherited in an autosomal dominant manner, meaning that only one copy of the defective gene is needed for the disease to develop.

Huntington Disease Is Caused by