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qj365
2 năm trước
Cho lai giống đậu Hà Lan thuần chủng , thân cao lai vs thân thấp, F1 thu đc tất cả các cây đều thân cao. Cho các cây F1 tự thụ phấn đc F2. Hãy giải thích và lập sơ đồ lai Cần các chuyên gia giúp em ạ !
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1) viết lại câu sao cho nghĩa ko thay đổi Câu 1:they played volleyball in the area yesterday Volleyball............................ Câu 2: They didn't help their mother last year Their mother................... Câu 3:I met Mary at John's party last night Mary................................ Câu 4:I wash the car every week The car.................... Câu 5:She has written many books recently Many books................ Câu 6:He likes wine I wish................... Câu 7:They didn't organize the party yesterday The party........................ câu 8:because it rained heavily.He didn't go to scholl It................................so...................... Câu 9:he spent two hours driving to Nha Trang next week it took him........................... Câu 10:They have built two bridges in the area Two bridges.......................... CÂU 11: We could about the contract The contract........................... cÂU 12: He is going to buy a lots of books tomorrow A lot of books,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Câu 13:We spent much money last week Much money......................... Câu 14:we often help her with her homework She................... Câu 15:They sell many kinds of jeans in the town Many kinds of jeans................................ Câu 16:Penicillin can cure many dangerous diseases Many dangerous.................................. bÀI 2: cjhuyển sang câu bị động Câu 1:peter took me a beautiful teacher Câu 2:will you invite her to your birthday party? Câu 3;The often play tennis in the afternoon Câu4:Many people in the world speak English Câu 5/:Does your country export rice to Briton

Giúp mik vs ah! 7. The children ___________ in the part at the moment. A. playing. B. is playing. C. are playing. D. plays. 8. My mother __________ a meal now. A. cooking. B. is cooking. C. cooks. D. cook. 9. It’s the sixth time I ___________ this novel. A. have been reading. B. am reading. C. have read. D. read. 10. Thomas ____________ Spanish since 2005. A. learnt. B. is learning. C. have learnt. D. has learnt. 11. Our city ____________ a lot so far. A. changes. B. has changed. C. changing. D. changed. 12. They __________ a new bridge from MT to BT recently. A. build. B. are building. C. have built. D. built. 13. Our teacher ___________ us a test every month. A. gives. B. is giving. C. giving. D. gives. 14. I ___________ coffee for breakfast every day. A. have. B. has. C. having. D. am having. 15. My brother _____________ in a shoe store now. A. work. B. working. C. is working. D. are working. 16. She __________ to school every day. A. go. B. goes. C. to go. D. going. 17. We ______________ this exercise at the moment. A. are do. B. am do. C. are doing. D. do. 18. Miss Helen ____________ a newspaper now. A. are reading. B. am reading. C. is reading. D. reading. 19. Mary _____________ ice-cream. A. love. B. loves. C. loving. D. is loving. 20. It _____________ much in the summer. It ____________ (rain) now. A. rain/ is raining. B. rain/ raining. C. rains/ is raining. D. rains/rains. 21. She _______________ trees in the garden now. A. plant. B. planting. C. to plant. D. is planting. 22. Students ______________ hard every day. A. working. B. to work. C. works. D. work. 23. ________________ to the radio now ? A. Are you listening. B. Is you listening. C. Do you listening. D. Be you listening. 24. I _____________ at seven o’clock every morning. A. am not get up. B. do not get up. C. does not get up. D. are not get up. 25. We always ___________ our exercises carefully. A. do. B. are doing. C. does. D. doing. 26. I ____________ to school every day. A. go. B. goes. C. going. D. am going. 27. My parents __________ in the garden now. A. sitting. B. are sitting. C. is sit. D. is sitting. 28. Ba likes ___________ TV every night. A. watches. B. watch. C. watching. D. is watching. 29. _____________ a novel at present ? A. Is he writing. B. Does he write. C. Did he write. D. Has he written. 30. I usually ___________ away at weekends. A. have gone. B. goes. C. am going. D. go. 31. The swimming pool ____________ at 9 o’clock and ___________ at 18.30 every day. A. opens/ closes. B. opens/ closed. C. opened/ closed. D. opened/ closes. 32. She sometimes ___________ vegetables at this market. A. is buying. B. has bought. C. buys. D. will buy. 33. My brother ___________ me for weeks. A. hasn’t phoned. B. didn’t phoned. C. isn’t phoning. D. not phoned. 34. The student ___________ that new word right now. A. is looking up. B. looks up. C. looked up. D. has looked up. 35. I ____________ Thomas since last week. A. have seen. B. don’t see. C. haven’t met. D. didn’t see.

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