Following the principles of pedigree analysis, we can determine that the 3rd individual from the 4th generation (IV-3) is an unaffected female. Looking at the 2nd and 3rd generation, it can be seen that the mode of inheritance is autosomal recessive.
Based on the pedigree shown below, what is the genotype of IV-3?
D. AA or Aa
E. Aa or aa
F. AA or aa
G. AA or Aa or aa
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