Bệnh bạch tạng do một gen lặn quy định. Một cặp vợ chồng có màu da bình thường và đều có kiểu gen dị hợp thì tỉ lệ phần trăm con của họ mắc bệnh bạch tạng là:

BT câu tường thuật pha trộn negative và positive

1, I often have a big hamburger => Benjamin says

2, If I were you, I’d stop talking tranquilizers. They won’t be good for you health in the long run => I said

3, Frank: How much pocket money Does Lisa get?

4, Don’t touch that wire, will you => Said the mother

5, Patricia: My mother will celebrate her birthday next weekend

6, I’m sorry I’m late => He said

7, Shall I do the cleaning up for you? => He said

8, If I were you, I would buy that book => she said

9, Why don’t we go to the cinema tonight? => He said

10, Would you like to come to my birthday party next Saturday? => She said