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1题目某遗传病的遗传涉及非同源染色体上的两对等位基因。已知Ⅰ_1基因型为AaBB,且Ⅱ_2与Ⅱ_3婚配的子代不会患病。根据以下系图谱(图1),正确的推断是(B)
1 Title The inheritance of a genetic disease involves two pairs of alleles on nonhomologous chromosomes. It is known that the I_1 genotype is AaBB, and the progeny of the II_2 and II_3 mates do not become ill. According to the following pedigree (Figure 1), the correct inference is (B)