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【單選題】
豌豆灰種皮（G）對白種皮（g）為顯性，黃子葉（Y）對綠 葉（y）為顯性。每對性狀的雜合體（F1）自交后代（F2）均表現為3︰1的性狀分離比。以上種皮顏色的分離比和子葉顏色的分離比分別來自對以下哪代植株所結種子的統計？ （ ）
A.
F1植株和F1植株
B.
F2植株和F2植株
C.
F1植株和F2植株
D.
F2植株和F1植株
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舉報參考答案：
舉一反三
【單選題】John received an invitation to dinner, and with this work ____ , he gladly accepted it .
A.
finished
B.
finishing
C.
having finished
D.
was finished
【單選題】What do we learn about Mary?
A.
She is on vacation.
B.
She travels around the world
C.
She collects postcards
【單選題】I had just stepped out of the bathroom and was busy drying myself with a towel ____ I heard the steps.
A.
while
B.
when
C.
since
D.
after
相關題目：
【單選題】John received an invitation to dinner, and with this work ____ , he gladly accepted it .
A.
finished
B.
finishing
C.
having finished
D.
was finished
【單選題】What do we learn about Mary?
A.
She is on vacation.
B.
She travels around the world
C.
She collects postcards
【單選題】I had just stepped out of the bathroom and was busy drying myself with a towel ____ I heard the steps.
A.
while
B.
when
C.
since
D.
after
參考解析：
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