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2 năm trước
câu 1: Người ta quan sát một nhóm tế bào mắt của ruồi giấm đang tiến hành phân bào thì thấy có 80 NST đơn đang phân ly về 2 cực của tế bào. a. Các tế bào trên đang ở kỳ nào của quá trình phân bào nào? c. Ý nghĩa của quá trình này? câu 2. Trong một gia đình có một cặp sinh đôi đều là con trai và có kiểu hình hoàn toàn giống nhau, em hãy cho biết: a. Cặp sinh đôi trên là đồng trứng hay khác trứng? b. Đặc điểm của chúng? Việc nghiên cứu trẻ đồng sinh có ý nghĩa gì trong nghiên cứu di truyền người?
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Ai giup minh voi B. VOCABULARY AND GRAMMAR I. Correct the verbs form to complete the sentences. 1. If you (go) away, please write to me. 2. If he (eat) another cake, he will be sick. 3. I (not do) that if I (be) you. 4. If he (take) my advice, everything can go well. 5. He never does homework. If he (do) his homework, he (not worry) about his exam. 6. What you (do) if she refuses your invitation? 7. If today (be) Sunday, we (go) to the beach. 8. Unless they (pass) their examinations, they would join the army. 9. You (be) ill if you drink that water. 10. If Tom (go) to bed earlier, he would not be so tired. 11. If it’s raining heavily, we (not go) for a donkey ride. 12. If he (try) hard, he’ll pass the examination. 13. I could understand the French teacher if she (speak) more slowly. 14. If I (finish) the work in time, I (go) to the football game. 15. If you (see) Mary today, please (ask) her to call me. II. Complete the sentences with the correct verb form in the bracket. 1. If someone offered to buy you one of those rings, which you (choose) ? 2. The flight may be cancelled if the fog (get) thick. 3. If the milkman (come) , tell him to leave two pints. 4. I (call) the office if I were you. 5. Someone (sit) on your glasses if you leave them there. 6. You would hear my explanation if you (not talk) so much. 7. What you (do) if you hear the burglar alarm? 8. If you (read) the instructions carefully, you wouldn’t have answered the wrong question. 9. If Mel (ask) her teacher, he’d have answered her questions. 10. I would repair the roof myself if I (have) a long ladder. 11. Unless they turn that radio off, I (go) mad. 12. If you were made redundant, what you (do) ? 13. We’ll have a long way to walk if we (run) out of petrol here. 14. If you shake that bottle of port, it (not be) fit to drink. 15. If you spoke louder, your classmates (understand) you. 16. I’ll probably get lost unless he (come) with me. 17. You (not have) so many accidents if you drove more slowly. 18. If you (wear) a false beard, nobody would have recognized you. 19. If she (leave) the fish here, the cat will eat it 20. You (have) no trouble at school if you had done your homework.

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