Biết A quy định thân cao, a quy định thân thấp, trội lặn hoàn toàn. Cho cây có kiểu gen lai với cây có kiểu gen thu được F1. Ở F1 loại bỏ hoàn toàn các cây thân thấp, sau đó cho cáccây F1 giao phấn ngẫu nhiên. Tỉ lệ kiểu hình cao:thấp ở F2 là
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