1. Ở ruồi giấm thân xám cánh dài lai với thân đen cánh cụt, F1 tòan xám dài. Lai phân tích ruồi cái F1, đời sau thu được 204 con xám dài, 206 con đen cụt, 26 con xám cụt, 26 con đen cụt. Biện luận và viết sơ đồ lai từ P đến Fa.
2. Cho ruồi giấm thân xám cánh dài lai với thân đen cánh cụt, F1 toàn xám dài. Cho F1 tự thụ. Viết sơ đồ lai từ P đến Fa biết tần số hoán vị gen là 20%.

Các bạn giải giúp mình với, mình cảm ơn.

Ở ruồi, gen quy định mắt trắng đột biến kém hơn gen quy định mắt đỏ(bình thường) 1 axit amin và có 2 axit amin mới.

a) Xác định dạng đột biến gen? Vị trí?

b) Chiều dài của gen mắt trắng như thế nào so với gen mắt đỏ?

c) Số Nu môi trường cung cấp giảm đi bao nhiêu? Biết gen mắt trắng kém hơn gen mắt đỏ 8 liên kết H.

Fill in each gap with one of the words given to form a compound adjective.

air; far; near; soft; time; cold; blue; easy; hard; shock; world; ready; absent; whole; short

1. .....-sighted people must wear glasses when they drive a car.

2. We can find a great number of ....-made clothes in this supermarket.

3. My mother doesn't mind who comes to stay, she's very ....-going.

4. My father usually has a ....-boiled egg and bread for breakfast.

5. ....-collar workers are those who work in industries, doing physical work.

6. Are all the rooms in this hotel ....-conditioned?

7. This is a ....-proof watch because it is designed to resist damage when knocked or dropped.

8. Everyone should make ......-hearted effort to fight against air pollution.

9. Hundreds of thousands of people were unemployed during the .....-wide economic depression.

10. My grandfather often forgets almost everything I tell him, he is so ....-minded.

11. Some of the more ....-consuming jobs can now be done by machines.

12. Daisy passed every exam she took because she was a very ....-working student.

13.....-blooded animals have a blood temperature which varies with the temperature of the surroundings.

14. The restaurant in front of my house is .....-handed, so they are all having to work much harder.

15. Many ....-reaching proposals were brought in at the Sustainable Development Summit organized by the United Nations in September 2002.

I. Put the adjectives in brackets in the correct position.

1. He lives in a town. (small).

2. Whales are because they are (blue / famous / big).

3. An elephant is a animal with a trunk. (big /long)

4. Thanks very much for your letter. (lovely)

5. You'll need a coat and boots. (warm / strong)

6. I'd like to work for a company. (international)

7. Cigarettes are so in our country. (expensive)

8. She told me some news. (awful)

9. You'll be to hear that our teacher retired month. (sad / old / last)

10. She suffers from vision and hearing. (poor)

II. Put the words into the correct order.

1. is / cold /it /getting.

2. grew / and / tired / hungry / he.

3. got / little / the /ready /girl.

4. promised / she /be /careful / to.

5. are / their / friendly / neighbours / very.

6. mountain / lovely / we / driving / along/ a road / were.

7. was / too/ we / go / further / couldn't / because / snow / deep / any / the.

8. to / naughty / the / short / child / decided/ a/ take / a / cut wood / through.

9. narrow / was / along / a / a / she / path / she / heard / noise / walking / when / loud.

Fill in each gap with one appropriate compound adjective

air-sick; airtight; trustworthy; snow-white; carsick; duty-free; homesick; waterproof; praiseworthy; good-tempered

Peter was a student living far from home. Because of his hard work at college, he rarely returned home and he sometimes felt (1) .... . Whenever he had a chance to go home to visit his family, he always went by train, not by plane or by car because was afraid of being (2) .... and (3) .... .

In his learning, he was very successful and always got good marks from all of his teachers, who often said that he was (4) .... and (5) .... had achievements. Besides, his friends often regarded him as a (6) ..... classmate because he was always willing to help them.

One day, he got the first prize with some money in a competition at college. He decided to go to a (7) .... shop for students to buy some chocolate kept in an (8) ...... container for his father, a (9) .... watch for his mother and a doll with (10) .... hair for his little sister .

Fill in each gap with one appropriate compound adjective.

one-egg; one-litre; three-course; five-minute; twelve-man; fifteen-piece; ten-ton; 2,000-word; thirty-five-hour; 4,000-year-old

1. Their cat was run over by a ... lorry.

2. The concert was performed by a ..... orchestra.

3. The man was convicted of murder by the .... jury.

4. The Vietnamese people are proud of their ..... history.

5. The price of a .... bottle of whisky has gone up by 90p.

6. The workers are on strike for better pay and a ..... week.

7. Peter can't go out. He has to write a .... essay by tomorrow.

8. I didn't have a big lunch. Just a .... omelette and some potatoes.

9. My new house is very handy for the shops and only a .... walk from my school.

10. At this excellent restaurant, we can get a .... meal and coffee just for $5 per person.