问题
选择题
用矮杆迟熟(ddEE)水稻和高杆早熟(DDee)水稻杂交，这两对基因自由组合。如希望得到200株矮杆早熟植株纯种，那么F2在理论上要多少株[ ]
A．800
B．1000
C．1600
D．3200
答案
答案：D
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用矮杆迟熟(ddEE)水稻和高杆早熟(DDee)水稻杂交，这两对基因自由组合。如希望得到200株矮杆早熟植株纯种，那么F2在理论上要多少株[ ]
A．800
B．1000
C．1600
D．3200
答案：D
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| During Christmas break from college, a young man wanted to borrow his father's car to drive to a New Year's Eve 1 to be held in Vermont. The father was 2 about the son hitting one of the roadblocks that people set up all over the place on New Year's Eve. The 3 that was reached was that the son would be allowed to use the car, but he would not drink at all. So he drove to Vermont, got completely 4 and attempted to drive home. On the way home he hit a roadblock. He was told to 5 the car and stand in a line of people that were being given the infamous sobriety (not drunk) 6 . However, the policeman 7 him out. He was 8 standing off to the side while the others were 9 the police officer how well they could walk a 10 line, etc. At 7:00 a.m., his father got up to answer the 11 . There were 12 policemen there. They asked him if he was the 13 of that red FIAT. He replied, "Yes, I am," One of the policemen asked him if he was driving the car the evening before and he said that his son had been the driver. When the young man 14 himself in front of the policemen, he knew he was in some sort of 15 . Upon questioning, he 16 that he was driving the car, but when asked if he had been 17 , he said, "No!" When the policemen asked if he could see his car, he was unable to remember the 18 . He said that it was in the garage. And when the four of them walked out to look at the car,instead of looking at the car he had driven the 19 before, they saw a 20 car parked there. | ||||
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