Huntington's Disease Is Caused by an Autosomal Dominant Allele

question 15

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.

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