问题
单项选择题
一对父本和母本通过有性生殖产生的后代,个体之间总会存在一些差异,这种变异主要来自()
A.基因突变
B.基因重组
C.基因分离
D.染色体变异
答案
参考答案:B
一对父本和母本通过有性生殖产生的后代,个体之间总会存在一些差异,这种变异主要来自()
A.基因突变
B.基因重组
C.基因分离
D.染色体变异
参考答案:B
阅读短文,连线。 | |||||||||||||||
In my room, you can see some books on the shelf. There are pink curtains behind the bed. The trash bin is near the sofa. The ball is under the desk. There is an air-conditioner over the mirror. I like my room.
|