Genes A and B are on different chromosomes. A dihybrid with the genotype AaBb undergoes meiosis. Which of the following depicts a possible genotype in a gamete? Genes A and B are on different chromosomes. A dihybrid with the genotype AaBb undergoes meiosis. Which of the following depicts a possible genotype in a gamete? A) Aa B) A C) Bb D) B E) AB Solution Since the genotype of the dihybrid is AaBb, the four possible gametes it can form are Ab, AB, ab and aB. Therefore from the choices given above, E is the correct answer..