个体间同一等位基因位点等位基因碱基长度即核苷酸链排列数量存在差异,表现为等位基因(),在()分离后,DNA图谱的()不同。
参考答案:大小不一;电泳;电泳迁移位置
— Did you go to the beaches?
— No, mum is ill _____ and I _____ stay at home to look after her. [ ]
A. on bed; must
B. on the bed; have to
C. in the bed; must
D. in bed; have to
波纹补偿器可以补偿吸收管道轴向、横向和()的热变形
A、正向
B、反向
C、径向
D、角向