[问答题]
1.Explain how parents with blood type A and blood type B can hf.z9oz9bqa7c,(6c* at ru oe qavq 6k6*rc7ywc)pky g i7e a child with blood tyqgwc66 yp 7k)*ky7 rcipe O.
2.Outline how polygenic traits can show a normal distribution.
3.Explain the role of inheritance in genetic diseases.