Ở đậu Hà Lan, Gen A Quy định Thân Cao Trội Hoàn Toàn So Với Alen A ...

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Ở đậu Hà Lan, gen A quy định thân cao trội hoàn toàn so với alen a quy định thân thấp; gen B quy định hoa đỏ trội hoàn toàn so với alen b quy định hoa trắng. Các gen đã cho nằm trên 2 cặp NST thường khác nhau. Cho đậu thân cao, hoa đỏ dị hợp về 2 cặp gen tự thụ phấn được F1. Nếu không có đột biến, tính theo lí thuyết thì xác suất các thể đồng hợp về 2 cặp gen thu được ở F1 là A. 1/4. B. 1/2. C. 1/8. D. 3/8. Đáp án và lời giải Đáp án:A Lời giải: P: AaBb × AaBb F1: 9A-B- : 3A-bb : 3aaB- : 1aabb Nếu không có đột biến, cá thể đồng hợp về 2 cặp gen có kiểu gen: 1/16AABB + 1/16AAbb + 1/16aaBB + 1/16aabb = 4/16 = ¼

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