题目

豌豆种群中偶尔会出现一种三体植株（多1条1号染色体），减数分裂时1号染色体的任意两条移白细胞一极，剩下一条移向另一极。下列关于某三体植株（基因型AAa）的叙述，正确的是A. 该植株来源于染色体变异，这种变异会导致基因种类增加B. 该植株在减数分裂时，含2个A基因的细胞应为减Ⅱ后期C. 三体豌豆植株自然状态下，产生基因型为AAa子代的概率为5/18D. 三体豌豆植株能产生四种配子，其中a配子的比例为1/4根据句意及首字母或汉语提示完成单词。（5分）1.—How many pounds do you w_________?—About 110 pounds.2.There is p_________ of water on the face of the globe.3.She was very famous for her_________ (勇气) and hard work.4.Jenny likes reading English_________ (杂志) in her free time.5._________ (现代的)zoos are much better than they used to be.（B）用所给词的适当形式填空。（5分）6.Linda practises_________ (play) the violin every Sunday.7.Which village in England is the_________ (far) from London?8.The sick boy has already been_________ (operate) on.9.The boy fell off the high tree but_________ (luck) he wasn’t badly hurt.10.The full_________ (long) of the Changjiang River is about 6, 300 kilometres.