Sarah's Mother Has Huntington's Disease, an Illness That Results from a Dominant

question 111

Multiple Choice

 Sarah's mother has Huntington's disease, an illness that results from a dominant gene. Her father, on the other hand, does not have the illness. What is the likelihood that Sarah herself will develop the disease?

• A) Sarah has no chance of developing the disease, as she would have inherited a healthy allele from her father.
• B) Sarah has a 50 percent chance of developing the disease, as her mother could have given her either a healthy allele or an allele that produces the illness.
• C) Sarah has a 50 percent chance of developing the disease, because her mother would not have the disease herself unless she was homozygous for Huntington's disease.
• D) Sarah has a 25 percent chance of developing the disease, because her father could be a carrier.

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