Biết rằng cây tứ bội giảm phân chỉ cho giao tử lưỡng bội có khả năng thụ tinh. Theo lí thuyết, phép lai giữa cây AAAa x Aaaa cho đời con có kiểu gen AAaa chiếm tỉ lệ
A.75%
B.50%
C.25%
D.56,25%
Đáp án và lời giải
Đáp án:B
Lời giải:AAAa cho giao tử AA = Aa =
Aaaa cho giao tử Aa = aa =
Tỉ lệ AAaa ở đời con là
x
+
x
=
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019401891786248616/obj2019401891786248616256123_images/obj2019401891786248616256123_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019401891786248616/obj2019401891786248616256123_images/obj2019401891786248616256123_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019401891786248616/obj2019401891786248616256123_images/obj2019401891786248616256123_img3.png)
![img4](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019401891786248616/obj2019401891786248616256123_images/obj2019401891786248616256123_img4.png)
![img5](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019401891786248616/obj2019401891786248616256123_images/obj2019401891786248616256123_img5.png)
![img6](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019401891786248616/obj2019401891786248616256123_images/obj2019401891786248616256123_img6.png)
![img7](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019401891786248616/obj2019401891786248616256123_images/obj2019401891786248616256123_img7.png)