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emxom4
2 năm trước
Ở một dạng bí, hai cặp tính trạng hình dạng quả và kích thước lá đi truyền độc lập với nhau. Quả tròn trội hoàn toàn so với quả dài, lá to trội hoàn toàn so với lá nhỏ. Giao phấn giữa hai cây thuần chủng mang hai cặp gen tương phản thu được F1 a. Lập sơ đồ lai từ P đến F1 b. Cho F1 giao phấn với một cây khác, ở F2 thu được tổng số tổ hợp giao tử bằng 4. Biện luận để lập sơ đồ lai có thể có của F1
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Các câu hỏi liên quan

Choose correct answers. 1. She is ....... singer I've ever met. A. worse B. bad C. the worst D. badly 2. Mary is ....... responsible as Peter. A. more B. the most C. much D. as 3. It is ....... in the city than it is in the country. A. noisily B. more noisier C. noisier D. noisy 4. She sings ........... among the singers I have known. A. the most beautiful B. the more beautiful C. the most beautifully D. the more beautifully 5. She is ....... student in my class. A. most hard-working B. more hard-working C. the most hard-working D. as hard-working 6. The English test was ....... than I thought it would be. A. the easier B. more easy C. easiest D. easier 7. English is thought to be ....... than Math. A. harder B. the more hard C. hardest D. the hardest 8. Jupiter is ....... planet in the solar system. A. the biggest B. the bigger C. bigger D. biggest 9. She runs ...... in my class. A. the slowest B. the most slow C. the slowly D. the most slowly 10. My house is ....... hers. A. cheap than B. cheaper C. more cheap than D. cheaper than 11. Her office is ....... away than mine. A. father B . more far C. farther D. farer 12. Tom is ....... than David. A. handsome B. the more handsome C. more handsome D. the most handsome 13. He did the test ........... I did. A. as bad as B. badder than C. more badly than D. worse than 14. A boat is ....... than a plane. A. slower B. slowest C. more slow D. more slower 15. My new sofa is ....... than the old one. A. more comfortable B. comfortably C. more comfortabler D. comfortable 16. My sister dances ........... than me. A. gooder B. weller C. better D. more good 17. My bedroom is ....... room in my house. A. tidier than B. the tidiest C. the most tidy D. more tidier 18. This road is ....... than that road. A. narrower B. narrow C. the most narrow D. more narrower 19. He drives ....... his brother. A. more careful than B. more carefully C. more carefully than D. as careful as 20. It was ....... day of the year. A. the colder B. the coldest C. coldest D. colder

The present perfect tense: Exercise 1: Rewrite each sentence as a positive, negative, or question: Example: She (be) has been here for several days. She has not been here for several days. Has she been here for several days? Tom (see) ______________this film before. I (finish) ______________ my exercise already. They (live) ______________ here since 1990. My father (just wash) ______________ his car. The students (discuss) ______________ the question recently. Mary (never, be) ______________ to Ha Noi. We (know) ______________ each other for 5 years. So far we (learn) ______________ five lessons. We (be) ______________ pen pals for a long time. They (stay) ______________ here since last week. Exercise 2: Bob (see) ______________ this movie before. Sandra (lend) ____________ her brother $ 200 so far. Rashid (just pass) ____________ his driving test. Karen (study) ____________ __________ Italian for three years now and is still studying. The teacher (already, tell) ____________ to be quite. Tim (not, take) ____________ many photos yet. Jorge (read) ____________ the newspaper already. We (not begin) _____________ to study for the test yet. John and I (be) ______________ pen pals for nearly 3 years. He (wear) ___________ the same coat since he (move) ___________ here. . I (not see) _____________ your brother recently. . They (not contact) _______________ to each other for a long time. How long _______________you (study) ______________ English? How many times _________ you (see) _______________him since he went to Edinburgh? Who is that woman? I (never/ see) _______________ her before. We (be) ____________ from French. We (be) ______________ there for 20 years. I (see) __________ that film several times because I like it. Mary (lose) _________________ her hat for 2 days. He (not finish) _______________ doing it yet. He (not see) ____________ him since Christmas. (live)_______________in Ho Chi Minh City since 1975. He (just see) ______________ her. They (already show) _______________ the film. I’m sorry the car is not here. I (just sell) ______________ it. The Bakers (be) ______________ in New York for 3 months. My brother (use) ______________ this computer for 2 years. They (live) ________________ in this street for a long time. Mr. Green (teach) ______________ French since he left London in 1997. She (not speak) _________________ to me since last week. Up to now, Hoa (work) _______________ very hard. Nhanh nha cô sắp kiểm tra r. làm đúng théo ví dụ nhé@_@

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