We should take part in such activities in future _____ we did yesterday. A. which B. as C. that D. than 答案:B16.豌豆种子的黄色(Y)对绿色(y)为显性,圆粒(R)对皱粒(r)为显性.让绿色圆粒豌豆与黄色皱粒豌豆杂交,F1都表现为黄色圆粒,F1自交得F2,F2有四种表现型.如果继续将F2中全部杂合的黄色圆粒种子播种后进行自交,所得后代的表现型比例为( )A.黄圆:黄皱:绿圆:绿皱=25:15:15:9B.黄圆:黄皱:绿圆:绿皱=25:5:5:1C.黄圆:黄皱:绿圆:绿皱=21:5:5:1D.黄圆:黄皱:绿圆:绿皱=16:4:4:1