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21. Mẫu sinh vật dùng cho phương pháp tạp giao thực nghiệm cần có các điều kiệna) Có chu kỳ đời sống ngắn b) Sinh được nhiều thế hệ con c) Cho ít biến dị d) Dễduy trì e) Cho nhiều biến dị f) Chu kỳ đời sống dàiA. b+c+d+f B. b+c+d+f C. a+b+d+e D. a+b+c+d
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