Ở một một loài thực vật, thân cao trội hoàn toàn so với thân thấp, hoa đỏ trội hoàn toàn so với hoa trắng. Biết rằng mỗi gen quy định một tính trạng và 2 gen cùng nằm trên một cặp NST. Thế hệ P, cho cây thân cao, hoa đỏ tự thụ phấn, F1 thu được 4% cây thân thấp, hoa trắng. Tỉ lệ cây thân cao, hoa trắng ở F1 là

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