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chuoi2305
2 năm trước
Trong các phát biểu về quá trình nguyên phân sau, có bao nhiêu phát biểu đúng? 1. Nếu trong kì đầu của quá trình NP, 1 tb có 60 cromatit. Khi kết thúc NP, mỗi tb con sẽ có 30 NST 2. 1 hợp tử ruồi giấm (2n=8) NP 4 đợt liên tiếp thì số NST kéo ở kì đầu của lần NP tiếp theo là 128 3. Có 8 phân tử ADN nhân đôi 3 đợt bằng nhau sẽ tạo ra 112 mạch polinucleotit mới lấy nguyên liệu hoàn toàn từ môi trường nội bào 4. Trong kì trung gian, sự nhân đôi ADN và NST diễn ra ở pha G1 A. 3 B. 2 C. 4 D. 1
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