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【單選題】
假定基因A是視網膜正常所必需的，基因B是視神經正常所必需的，（注：只有當A和B同時存在時，視覺才正常）。這兩類基因分別位于非同源染色體上。現有基因型均為AaBb的雙親，從理論上分析，他們所生的后代視覺正常的可能性是（ ）
A.
3/16
B.
4/16
C.
7/16
D.
9/16
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舉報參考答案：
舉一反三
【單選題】The old lady likes to keep things in the house, _____ throw them away, though many are useless.
A.
more than
B.
but also
C.
as if
D.
rather than
【單選題】What are we told in the passage?
A.
Nightingale had the same name as the city of her birth.
B.
Nightingale’s p arents supported her decisions all the time.
C.
Nightingale didn’t want to marry.
D.
Nightingale only visited the wounded at night.
【單選題】What was the purpose of Nightingale’s trip to Europe in 1849?
A.
To learn many languages.
B.
To study the hospital system there.
C.
To examine the hospitals there.
D.
To manage the hospitals there.
相關題目：
【單選題】The old lady likes to keep things in the house, _____ throw them away, though many are useless.
A.
more than
B.
but also
C.
as if
D.
rather than
【單選題】What are we told in the passage?
A.
Nightingale had the same name as the city of her birth.
B.
Nightingale’s p arents supported her decisions all the time.
C.
Nightingale didn’t want to marry.
D.
Nightingale only visited the wounded at night.
【單選題】What was the purpose of Nightingale’s trip to Europe in 1849?
A.
To learn many languages.
B.
To study the hospital system there.
C.
To examine the hospitals there.
D.
To manage the hospitals there.
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