问题
单项选择题
两株高茎豌豆杂交，子代都是高茎豌豆，则其亲本的遗传因子组合不可能是（）
A．DD×DD
B．DD×Dd
C．Dd×DD
D．Dd×Dd
答案
参考答案：D
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两株高茎豌豆杂交，子代都是高茎豌豆，则其亲本的遗传因子组合不可能是（）
A．DD×DD
B．DD×Dd
C．Dd×DD
D．Dd×Dd
参考答案：D
| 35．Applications put computers to pratical business (1) , but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (3) . A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time. The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail. |
(1)
A．coupled
B．dependent
C．independent
D．related