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
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