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3. Một trong những lĩnh vực nghiên cứu của dị truyền tế bào học là: A. Nghiên cứu chất nhiễm sắc giới tính B. Nghiên cứu đột biến thêm nucleotid C. Nghiên cứu đột biến mất nucleotid D. Nghiên cứu đột biến dịch khung đọc mã
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