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Câu hỏi: Phép lai nào sau đây cho đời con có tỉ lệ phân li kiểu gen là 1:2:1?
A. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{AB}}}{\text{Ab}}$
B. $\dfrac{\underline{\text{Ab}}}{\text{aB}}\times \dfrac{\underline{\text{AB}}}{\text{ab}}$
C. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{Ab}}}{\text{Ab}}$
D. $\dfrac{\underline{\text{AB}}}{\text{ab}}\times \dfrac{\underline{\text{aB}}}{\text{ab}}$
A. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{AB}}}{\text{Ab}}$
B. $\dfrac{\underline{\text{Ab}}}{\text{aB}}\times \dfrac{\underline{\text{AB}}}{\text{ab}}$
C. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{Ab}}}{\text{Ab}}$
D. $\dfrac{\underline{\text{AB}}}{\text{ab}}\times \dfrac{\underline{\text{aB}}}{\text{ab}}$
Giải thích:
A. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{AB}}}{\text{Ab}}$ tỉ lệ kiểu gen 1:2:1
B. $\dfrac{\underline{\text{Ab}}}{\text{aB}}\times \dfrac{\underline{\text{AB}}}{\text{ab}}$ tỉ lệ kiểu gen 1:1:1:1
C. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{Ab}}}{\text{Ab}}$ tỉ lệ kiểu gen: 1: 1
D. $\dfrac{\underline{\text{AB}}}{\text{ab}}\times \dfrac{\underline{\text{aB}}}{\text{ab}}$ tỉ lệ kiểu gen 1:1:1:1
A. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{AB}}}{\text{Ab}}$ tỉ lệ kiểu gen 1:2:1
B. $\dfrac{\underline{\text{Ab}}}{\text{aB}}\times \dfrac{\underline{\text{AB}}}{\text{ab}}$ tỉ lệ kiểu gen 1:1:1:1
C. $\dfrac{\underline{\text{AB}}}{\text{Ab}}\times \dfrac{\underline{\text{Ab}}}{\text{Ab}}$ tỉ lệ kiểu gen: 1: 1
D. $\dfrac{\underline{\text{AB}}}{\text{ab}}\times \dfrac{\underline{\text{aB}}}{\text{ab}}$ tỉ lệ kiểu gen 1:1:1:1
Đáp án A.