Huntington's Disease Is Caused by an Autosomal Dominant Allele

Multiple Choice

Huntington's disease is caused by an autosomal dominant allele.It is a lethal disease,but it persists in the human population.Which of the following statements best describes why?

A) Huntington's disease is sex-linked and every human has at least one X chromosome;thus,the chances are extremely high for this allele to be maintained in the human population.
B) Huntington's disease presents symptoms that resemble cases reflecting a lack of dominance in some individuals;in those cases,the allele is passed on to the offspring.
C) While lethal to a parent,Huntington's disease will not be lethal to the offspring since it can skip a generation.
D) Huntington's disease presents symptoms in humans after many have already reproduced;therefore,they are unaware that they passed on Huntington's disease.
E) Huntington's disease can be treated in humans that are heterozygous for the condition,but individuals who are homozygous cannot receive treatments;thus,they pass on the alleles to their offspring.