Bài 1 : Nhóm 200 tế bào sinh tinh có kiểu gen Bd/bD giảm phân , nếu tần số TĐChéo là 20% thì có bao nhiêu tế bào không xảy ra trao đổi chéo Bài 2 : Một nhóm có 120 tế bào sinh tinh có kiểu gen AB/ab giảm phân , trong đó xảy ra TĐChéo ở 20 tế bào . Xác định số loại giao tử , tỷ lệ các giao tử . Nếu tần số TĐC bằng tổng tỉ lệ các giao tử sinh ra TĐC thì tần số TĐC f bằng bao nhiêu

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Rewrite the sentences using “wish”. 1. I have to study hard.  I wish ................................................................................................................ 2. We had a lot of homework yesterday.  I wish ................................................................................................................ 3. It is raining heavily.  I wish ................................................................................................................ UNIT 4: LIFE IN THE PAST 43 4. It was cold last night.  I wish ................................................................................................................ 5. They work slowly.  I wish ................................................................................................................ 6. She doesn’t join in the trip.  I wish ................................................................................................................ 7. I am not good at English.  I wish ................................................................................................................ 8. He studies badly.  I wish ................................................................................................................ 9. He doesn’t like playing sports.  I wish ................................................................................................................ 10. I don’t have a computer.  I wish ................................................................................................................ 11. Today isn’t a holiday.  I wish ................................................................................................................ 12. I can’t sing this song.  I wish ................................................................................................................ 13. He was punished by his mother.  I wish ................................................................................................................ 14. They won’t come here again.  I wish ................................................................................................................ 15. He won’t go swimming with me.  I wish ................................................................................................................ 16. We didn’t understand them.  I wish ................................................................................................................