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.
Answer: B
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