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hieu.vu362001
2 năm trước
1 tb sinh dục của ngô 2n=20 qua 10 đợt np liên tiếp tại vùng sinh sản , các tb con sinh ra chuyển qua vùng sinh trưởng và bước vào vùng chín a, xác định số lượng thoi tơ vô sắc được hình thành ở vùng sinh trưởng và sinh sản b. số loại giao tử được hình thành nếu biết có 1 cắp nst mà 2 nst đơn có cấu trúc giống nhau biết ko trao đổi đoạn và đột biến
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