Giao phấn giữa hai cây (P) đều có hoa màu trắng thuần chủng, thu được F1 gồm 100% cây có hoa màu đỏ. Cho F1 tự thụ phấn, thu được F2 có kiểu hình phân ly theo tỷ lệ 9 cây hoa màu đỏ : 7 cây hoa màu trắng. Chọn ngẫu nhiên hai cây có hoa màu đỏ ở F2 cho giao phấn với nhau. Cho biết không có đột biến xảy ra, tính theo lý thuyết, xác suất để xuất hiện cây hoa màu trắng có kiểu gen đồng hợp lặn ở F3 là:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  There is no excuse for your __________. Think twice before you are going to say anything.
  
  

• Choose the best answer for the following sentence:

  He earned a fortune because of a painting previously _____________ as worthless, but now turning out to be very valuable.
   

• Choose the best answer for the following sentence:

  I was not ____________ to go to parties in the evening until I reached the age of eighteen.
   

• Choose the best answer for the following sentence:

  I do think that following __________ is a waste of money and time. It changes almost every day.
   

• Choose the best answer for the following sentence:

  If you don't want to be expelled, just learn to obey the school __________.
  
  

• Choose the best answer for the following sentence:

  Son: "I have been familiar to the new learning environment." Father to Mother: "Our son said (that) he ___________ familiar to the new learning environment."
   

• Choose the best answer for the following sentence:

  Laura: "I won't buy the house until I have saved enough money."
  Sam: "Laura said (that) she ____________ buy the house until I had saved enough money."
   

• Choose the best answer for the following sentence:

  Little Mary: "I have to do my homework right now."
  Jack:" Little Mary said (that) she ____________ to do her homework right then."
   

• Choose the best answer for the following sentence:

  Miss Claymore: "One month ago, I warned you not to cheat in that test!"
  Miss Claymore said that she ______________ me not to cheat in that test one month before.
   

• Choose the best answer for the following sentence:

  Roeun said, "I have got to pick up my cousin from the airport at three o'clock."
  Roeun said that he ____________ to pick up his cousin from the airport at three o'clock.