user-avatar
356804582200872
2 năm trước
Lai cây cà chua đỏ, tròn với cây cà chua quar vàng,bầu dục.Người ta thu được các câu F1 đều có quả đỏ, tròn.Sau đó người ta cho cây F1 lai với cây quả đỏ, bầu dục, người ta thu được 3/8 số cây con có quả đỏ, tròn; 3/8 số cây con có quả đỏ, bầu dục;1/8 số cây con có quả vàng, bầu dục;1/8 số cây có quả vàng, tròn.Hãy giải thích kết quả lai trên và viết sơ đồ lai.(CẦN GẤP Ạ)
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

22. I accidentally _ Mike when I was crossing a street downtown yesterday. A. kept an eye on B. lost touch with C. paid attention to D. caught sight of 23. If you want a flat in the center of the city you have to pay through the for it. A. teeth B. back of your head C. nose D. arm 24. Those smart phones are selling like _. If you want one, you’d better buy one now before they’re all gone. A. shooting stars B. fresh bread C. hot cakes D. wild oats 25. She was so frightened that she was shaking like . A. a leaf B. the wind C. a flag D. jelly 26. Peter was born and brought up in Hastings and knows it like the . A. nose on his face B. tip of the tongue C. back of his hand D. hair on his head 27. What’s wrong with you today? Did you get out of bed on the wrong ? A. end B. foot C. side D. edge 28. I’ve never enjoyed going to the ballet or the opera; they’re not really my . A. piece of cake B. chip off the old block C. biscuit D. cup of tea 29. “What’s wrong with Tom today? He’s unusually quiet,” “He’s got something on his . I expect”. A. brain B. mind C. thoughts D. brow 30. He was wearing very shabby, dirty clothes and looked very . A. easy- going B. down to earth C. out of shape D. down at heel 31. Since he started his own business he has been making money hand over . A. fist B. heel C. head D. palm 32. I can’t see us beating them at tennis this year- we’re so out of _. A. step B. practice C. fitness D. breath

I. Choose A, B, C or D to indicate the correct answer to each of the following questions. 1. I really must go and lie down for a while; I’ve gone a headache. A. cutting B. cracking C. exploding D. splitting 2. Stop about the bush, John! Just tell me exactly what the problem is. A. beating B. rushing C. hiding D. coming 3. I always get in stomach before sitting an exam. A. worms B. butterflies C. crabs D. birds 4. I usually buy my clothes . It’s cheaper than going to dressmaker. A. off the peg B. on the house C. on the shelf D. in public 5. We spent the entire day looking for a new apartment. The phrase “the entire day” is closest in meaning to . A. all day long B. the long day C. all long day D. day after day 6. I was already fed up with the job, but when the boss walked into my office and told me he expected me to work overtime that was the . A. final curtain B. last straw C. end of the line D. last waltz 7. I couldn’t believe that they were brothers. They were different as__ . A. Mars and Jupiter B. chalk from cheese C. dogs and cats C. milk from honey 8. Li has ; he loves cakes, chocolates, ice-cream-anything which is sweet. A. a sweet mouth B. sweet lips C. a sweet tongue D. a sweet tooth 9. It never my mind he will tell lies to me. A. crosses B. enters C. comes D. happens 20. A. did B. made C. caused D. Created 10. I just took it that he’d always be available. A. into consideration B. easy C. into account D. for granted

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team