user-avatar
phamchien1982aia
2 năm trước
Có 4 tế bào (A, B, C, D) nguyên phân 1 số lần tạo ra 292 tế bào con. Số đợt nguyên phân tế bào B gấp 2 lần số đợt nguyên phân tế bào A nhưng chỉ bằng 1/2 số đợt nguyên phân tế bào D. Bộ NST mỗi tế bào lần lượt tỉ lệ với 1:2:2:1. Tổng số NST trong các tế bào con là 2592. Xác định: a, Số đợt nguyên phân mỗi tế bào. Biết số đợt nguyên phân tế bào C lớn hơn số đợt nguyên phân tế bào A. b, Bộ NST mỗi tế bào.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Choose the best answer from A, B, C or D to complete each of the following sentences. 1. _______ July 20,1969, Neil Armstrong was the first human to step _______ the moon. A. On; on B. In; on C. In; in D. At; at 2. Her daughter has _______. A. a short black hair B. a black short hair C. short black hair D. black short hair 3. David can speak English ________ because he practices speaking it every day A. very good B. very hard C. very well D. very badly 4. The weather in developing countries is becoming _______. A. bad and bad B. worse and worse C. worst and worst D. the worst 5. When I lived in the city, I often went to work late because of _______ in rush hours. A. noise B. pollution C. traffic jam D. people 6. Neither they nor she _______ the liveshows. A. like B. don’t like C. likes D. not like 7. She _______ a bath when they came. A. had B. was having C. is having D. has 8. Every year, Mid - Autumn Festival _______ for children. A. is organized B. organizes C. is organizing D. organized 9. Do you mind if I _______ TV while eating lunch? A. watch B. watched C. am watching D. was watching 10. My friend _______ the answer to the question now. A. is known B. know C. is knowing D. knows

Read these passages and match the each passage to its title. There is ONE title you needn’t use. A. How I began D. My most frightening experience B. The worst aspect of my hobby E. Why I like my hobby C. My hopes for the future F. When and where I do it 1. ___________ For me, every weekday begins the same: I get up at 7.00. I have breakfast, I take the bus to school, I go to lessons ... I don’t hate this daily routine, but it isn’t very thrilling. In the evenings, however, I drive Formula 1 cars, build enormous cities and defend my planet against aliens. In short, I play computer games. It’s like entering a different world. That’s why I love playing them so much. 2. ___________ My interest in computer games has taught me a lot about computer graphics. I want to study computing at college, and learn how to design and program games. Eventually, I’d like to start my own software company, creating and testing new games. That way, I could spend all day doing what I love most. 3. ___________ Computer games are interesting because they often contain stories and characters. The games are getting better all the time, but they are also getting more expensive. The only thing I don’t like about my hobby is the cost! New games are often about $50. 4. ___________ Some of my friends from school are interested in computer games too. We normally meet at my house in the evenings and play for a few hours. We sometimes play at weekends, but if the weather’s good I prefer to go cycling or play basketball instead. 5. ___________ I first became interested in computer games about four years ago. I was staying with my cousin for the weekend. He had some games and he taught me how to play them. I became hooked immediately! When I got home, I decided to save all my money for buying games. Now I’ve got about twenty different games.

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