Final answer:
The most likely genotypes for individuals I-1 and I-2 in this pedigree, based on autosomal dominant inheritance, are either AA or Aa.
Step-by-step explanation:
In this pedigree, individuals I-1 and I-2 are represented by the shaded symbols, indicating that they express the dominant trait. Based on the principles of autosomal dominant inheritance, individuals who express the dominant trait must have at least one dominant allele. Therefore, the most likely genotypes for individuals I-1 and I-2 would be either AA or Aa.