题目

My daughter, 15, has been in karate (空手道) since the first grade, and has been in high honor and gifted classes. My 11-year-old son, Tom, for years would fight with me over everything. If I said the sky was blue, he would say it was black. For years he was falling several subjects. We took games away, then TV and finally the smart phone; we tried a reward program, but nothing worked long. He would bring a grade up to get all his things back, and then go back to where he had been.My daughter told me one day to bring him to her karate class, and maybe life in the martial arts (武术) would下图是果蝇细胞减数分裂示意图，下列说法正确的是 A．图I表示的细胞中有8条染色体、4个染色体组B．①过程可能发生同源染色体的交叉互换和自由组合C．图III中的a、b、c、d 4个细胞不可能有三个极体产生D．若a细胞内有5条染色体，一定是过程②出现异常