Ở cà chua tính trạng quả đỏ là trội hoàn toàn được quy định bởi gen A số với tính trạng quả vàng được quy định bởi gen a là lặn .cho lại cà chua bố mẹ thuần chủng quả đỏ với quả vàng thu được toàn cà chua quả đỏ a, giáo phối cây cà chua F1. Xác định tỉ lệ kiểu gen, kiểu hình ở F2 b, làm thế nào để biết cà chua ở F1 là thuần chủng hay k thuần chủng

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