Ở một loài thực vật, tính trạng màu hoa do 2 cặp gen Aa và Bb nằm trên 2 cặp NST khác nhau tương tác theo kiểu bổ sung. Trong kểu gen có cả A và B quy định hoa đỏ, chỉ co 1 gen trội A hoặc B quy định hoa hồng, đồng hợp lặn aabb quy định hoa trắng. Cho cây hoa đỏ lai với cây hoa hồng được F₁ cho 2 loại kiểu hình phân li theo tỉ lệ 75% cây hoa đỏ: 25% cây hoa hồng. Theo lí thuyết có bao nhiêu sơ đồ lai phù hợp với phép lai trên (chỉ xét phép lai thuận, không xét phép lai nghịch) 

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Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions:

  We decided to pay for the furniture on the installment plan.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each off the following questions:

  The use of lasers in surgery has become relatively common place in recent years.  

• Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each off the following questions:

  From an airplane, the grasslands of the western prairie appear almost as uniform as a placid sea.  

• Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions:

  She got up late and rushed to the bus stop.         

• Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is CLOSEST is meaning to the underlined part in each of the following questions:

  Domestic chores will no longer be a burden thanks to the inventions of laborsaving devices.         

• CLOSEST in meaning to the underlined word(s) in each of the following questions:

  It is vital to recognize that emotions trigger physiological reactions – and vice versa.         

• Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions:

  The collapse of the stock market in 1929 signaled the beginning of the Depression.  

• Choose the letter A, B, C or D to indicate the words CLOSEST in meaning to the underlined part in each of the following questions:

  In the twentieth century, drug markedly improved health throughout the world.           

• Mark the letter A, B, C, or D to indicate the word or phrase CLOSEST in meaning to the bold and underlined part in each of the following questions:

  I told you clearly and definitely not to write your answers in pencil, Smith!         

• Mark the letter A, B, C, or D to indicate the word or phrase CLOSEST in meaning to the bold and underlined part in each of the following questions:

  We decided to pay for the car on the installment plan.