Ở đậu Hà lan: Tính trạng hạt trơn là trội so với hạt nhăn. Cho đậu hạt trơn lai với đậu hạt nhăn thu được F1 đồng loạt hạt trơn. F1 tự thụ phấn được F2 . Cho rằng mỗi quả đậu F2 có 4 hạt. Xác suất để bắt gặp quả đậu có 3 hạt trơn và 1 hạt nhăn là bao nhiêu?
A. 3/ 16. B. 27/ 256. C. 9/ 16. D. 9/ 256.

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