question: The pedigree in <image 1> shows the mode of inheritance of a human disease that is associated with mutations in Gene A. Note: Individuals marrying into this family DO NOT have the disease-associated allele unless shaded and the pedigree is completely penetrant. What is the genotype(s) of Individual 9?
  Options: A: XAXa, B: Aa, C: Aa or AA, D: XAXA