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【單選題】
某種鼠中，黃鼠基因A對灰鼠基因a顯性，短尾基因B對長尾基因b。且基因A或b在純合時使胚胎致死，這兩對基因是獨(dú)立遺傳的。現(xiàn)有兩只雙雜合的黃色短尾鼠交配，理論上所生的子代表現(xiàn)型比例為（ ）
A.
2∶1
B.
9∶3∶3∶1
C.
4∶2∶2∶1
D.
1∶1∶1∶1
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舉報參考答案：
舉一反三
【單選題】The passage is mainly about_______.
A.
the importance of spending time with children
B.
the ways to spend time with children
C.
the reasons to spend time with children
D.
the activities children like to take part in
【單選題】What problem do the astronauts meet during the flight?
A.
There is something wrong with the computer.
B.
There is big noise in the spaceship.
C.
They find it hard to stand each other`s living habits.
【單選題】Which of the following expressions can sh ow someone is nervous?
A.
Get caught with one's pants down.
B.
Have ants in one's pants.
C.
Wear the pants in the family.
D.
Bum a hole in one's pocket.
【單選題】Someone who spends his money at the drop of a hat most probably_______.
A.
doesn’t save money
B.
earns much money
C.
never wastes his money
D.
spends more than he earns
【單選題】If we say someone has to tighten his belt, we probably mean he_______.
A.
has done something wrong
B.
used to live a rich life
C.
has put on the wrong pants
D.
doesn’t have enough money
相關(guān)題目：
【單選題】The passage is mainly about_______.
A.
the importance of spending time with children
B.
the ways to spend time with children
C.
the reasons to spend time with children
D.
the activities children like to take part in
【單選題】What problem do the astronauts meet during the flight?
A.
There is something wrong with the computer.
B.
There is big noise in the spaceship.
C.
They find it hard to stand each other`s living habits.
【單選題】Which of the following expressions can sh ow someone is nervous?
A.
Get caught with one's pants down.
B.
Have ants in one's pants.
C.
Wear the pants in the family.
D.
Bum a hole in one's pocket.
【單選題】Someone who spends his money at the drop of a hat most probably_______.
A.
doesn’t save money
B.
earns much money
C.
never wastes his money
D.
spends more than he earns
【單選題】If we say someone has to tighten his belt, we probably mean he_______.
A.
has done something wrong
B.
used to live a rich life
C.
has put on the wrong pants
D.
doesn’t have enough money
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