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thyumc_pro
2 năm trước
Cho các phát biểu sau về quá trình nguyên phân 1. ở kì đầu của nguyên phân có sự tiếp hợp và trao đổi đoạn giữa các sợi cromatit trong cặp NST kép tđ 2. ở kì sau nguyên phân các NST xếp thành 1 hàng ở mặt phẳng xích đạo của thoi phân bào 3. ở kì sau nguyên phân 2 cromatit chị em của NST kép tách ở tâm động và phân li đồng đều 4. ở kì đầu nguyên phân có sự phân li của cặp NST kép tđ tạo sự đa dạng của các giao tử. Phát biểu nào đúng
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