Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Jack was over confident. Therefore, he ruined our plan completely.

A. It was Jack’s overconfidence ruined our plan completely. 

B. It was because Jack’s overconfidence that ruined our plan completely. 

C. Jack was overconfident, which ruined our plan completely. 

D. That was Jack’s overconfidence ruined our plan completely.

Thực hiện phép lai: ♂ AabbCcDdee x ♀ aaBBCCDdEe. Biết rằng không có đột biến xảy ra. Theo lý thuyết, tỉ lệ cá thể mang 4 alen trội ở đời con là bao nhiêu?

A. 37,25%  

B. 18,75%  

C. 24,75%  

D. 31,25%