Cho biết mỗi cặp gen quy định một cặp tính trạng và gen trội là trội hoàn toàn, cơ thể tứ bội giảm phân chỉ sinh ra giao tử lưỡng bội có khả năng thụ tinh. Xét các phép lai sau: (1)       AAaaBbbb x aaaaBBbb (2) AAaaBBbb x AaaaBbbb (3) AaaaBBBb x AAaaBbbb (4) AaaaBBbb x Aabb (5) AaaaBBbb x aaaaBbbb (6) AaaaBBbb x aabb  Theo lí thuyết trong 6 phép lai nói trên có bao nhiêu phép lai mà đời con có 12 kiểu gen, 4 kiểu hình?

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  It’s my brother ____________ gave me this hat on my birthday.

   

• Choose the best answer for the following sentence:

  It was a letter ____________ she received from her aunt yesterday.
   

• Choose the best answer for the following sentence:

  It is ____________ who I want to make friend with.
   

• Choose the best answer for the following sentence:

  I’ve just learned to play the guitar, and I can only play a few simple _____________.
   

• Choose the best answer for the following sentence:

  Another hobby of my brother’s is _____________.
   

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

  The stranger asked me a lot of questions.
  
  

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

  We're going to visit our grandparents on Saturday.
  
  

• Choose a word that has different stress pattern:

  outdoor              pastime              include              garden

• Choose a word that has different stress pattern:

  shoemaker              practical            generous              improvement

• Choose a word that has different stress pattern:

  instrument              entertain               popular              quality