Huntington's Disease Is Caused by a Single Dominant Allele

question 31

Multiple Choice

Huntington's disease is caused by a single dominant allele.It is a lethal disease, yet 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 can present symptoms so mild that they appear to lack dominant expression of the allele 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 mid-life, after most people have already had offspring.

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