Cho cơ thể có kiểu gen AB//ab CD//cd  trong quá trình giảm phân  xẩy ra trao đổi chéo giữa A và B với tần số 20%, trao đổi chéo giữa C và D với tần số 10% . Tỷ lệ giao tử  abcd là

A. 18%.

B. 2%.

C.4,5%.

D. 12%.

1. ____Although____ we had planned everything carefully, a lot of things went wrong.

2. I did not go to hospital _____even though______ I was feeling very ill.

3. I went to work the next day _____though________ I was still feeling ill.

4. She accepted the job ______in spite of________ the low salary.

5. She refused the job ______because of_____ the low salary.

6. I managed to sleep _____although____ the hotel was noisy.

7. I couldn't get to sleep ______because of______ the noise.

8. He runs fast ____depite___ his old age.

9. ____Although____ they have a car, they rarely go outside.

10. _____Even though______ he was innocent, he was sent to prison.

11. ____Although____ he has a number of relatives living nearby, he never visits them.

12. _____Depite____ not doing any exercises, she doesn't get fat.

13. ___Although_______ beingboverweight, I eat lots of chocolate everyday.