题目内容

[ A ] recently
[ B ] frequently
[ C ] realistically
[ D ] immediately

查看答案
更多问题

如果你发现了一株雄性不育植株。你如何确定它究竟是单倍体,远缘杂交F1、生理不育、核不育还是细胞质不育?

玉米T、S、C 3组不育类型。用自交系测交,结果有些自交系对这3组均可恢复;有些对3组均不能恢复;还有一部分或能

—________the town was attacked by the storm several times, Iittle damage was done.
[A]As
[B]lf
[C] Since
[D]Although

有人用一个不育系与恢复系杂交,得到正常散粉且花粉全可育的F1,用其花粉再授给该不育系,结果在回交群体里分离出89株可育株和271株不育株。试分析该不育系的类型及其遗传基础。

答案查题题库