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vankhang
2 năm trước
Người ta đem lai cà chua quả tròn với cả chua quả bầu dục , F1 thu được 315 cây cà chua quả tròn ; 105 cây cà chua quả bầu dục. Biết rằng tính trạng hình dạng quả do 1 gen quy định. Hãy giải thích kết quả và viết sơ đồ lai
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Part 2. Put the verbs given in brackets into the appropriate tenses or forms. (5pts) 35. “You were late for your dental appointment.” “I know. I (not/ stay) .................. so long at the library.” 36. It is necessary that everyone (be) .................. calm in times of danger. 38. If you want to see us, come to Tom’s on Sunday. We (wait) .................. for you there at midday. 39. It was a fine day and the roads were crowded because a lot of people (rush) .................. to the seaside. 40. Those were the highest words of praise they ever (hear) .................. from the old man. 41. Our little children enjoy (take) .................. to the water park every Sunday. 42. I don’t feel good. I (stay) .................. home from work tomorrow. 43. It won’t be safe to use these stairs until they (repair) .................. . 44. The city is now crowded with the people who (seek) .................. employment. 45. The old man is said (leave) .................... all his money to an old people’s home when he died.

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