— Did you have a basketball match last Sunday? — No. It has to be put off(推迟) ________ the heavy rain. A. because B. because of C. such as D. although 答案:B一对杂合的黑豚鼠产仔4只,4只鼠仔的表现型为三黑一白,对此最好的解释是( )
A、3:1符合基因的分离定律B、该遗传不符合基因的分离定律C、该对豚鼠每胎都有出现白色鼠仔的可能性D、黑色基因和白色基因发生了自由组合