Tính trạng hình dạng hạt lúa do một gen có 2 alen qui định và trội lặn hoàn toàn. Cho lúa hạt tròn lai với lúa hạt dài, F1 100% lúa hạt dài. Cho F1 tự thụ phấn được F2. Trong số lúa hạt dài F2, tính theo lí thuyết thì số cây hạt dài khi tự thụ phấn cho F3 toàn lúa hạt dài chiếm tỉ lệ        

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose one sentence that has the same meaning as the root one:

  It is believed that the man escaped in a stolen car.
  
  

• Choose one sentence that has the same meaning as the root one:

  I didn’t have an umbrella with me, so I got wet.
  
  

• Choose one sentence that has the same meaning as the root one:

  The coffee was too hot for me to drink.
  
  

• Choose one sentence that has the same meaning as the root one:

  In spite of their differences, Peter and John plan to be roommates.
  
  

• Choose one sentence that has the same meaning as the root one:

  It won't be long before her husband comes back.

   

• Choose one sentence that has the same meaning as the root one:

  Nothing but the whole story would satisfy Tim.
  
  

• Choose one sentence that has the same meaning as the root one:

  I should have studied last night, but I was too tired.
  
  

• Choose one sentence that has the same meaning as the root one:

  I have never felt better than I do now.
  
  

• Choose one sentence that has the same meaning as the root one:

  “Cigarettes?” he asked. “No, thanks,” I said.
  
  

• Choose one sentence that has the same meaning as the root one:

  The doctor said, “You really ought to rest for a few days, Jasmine.”