ở người gen A quy định tóc xoăn trội hoàn toàn so với gen a quy định tóc thẳng gen B quy định mắt đen trội hoàn toàn so với gen b quy định mắt xanh. Các gen này phân li độc lập với nhau . Bố tóc xoăn mắt đen có kiểu gen AABB;mẹ tóc thẳng mắt xanh.Tính theo lí thuyết con sinh ra có tóc xoăn mắt đen chiếm tỉ lệ: A: 0% B:25% C:75% D:100%

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