问题
名词解释
突变的可逆性
答案
参考答案：
即显性基因A可突变为隐性基因a，而隐性基因a可突变形成显性基因A
搜题请搜索小程序“爱下问搜题”
突变的可逆性
参考答案：
即显性基因A可突变为隐性基因a，而隐性基因a可突变形成显性基因A
| Questions 17 to 20 are based on the following biographies for the presidential candidates in US 2008. You now have 20 seconds to read Questions 17 to 20. |
In which university did Barack Obama’s parents study
A．Columbia University.
B．The University of Chicago Law School.
C．The University of Illinois.
D．The University of Hawaii.