分,母万1)X正常翅和小翅在子代雌雄个体中的性状分离比不同,说明Aa基因位于X染色体上(2)0 boXY、 boXYbXA: bXa: bY=l: 1:2(3)5:11(4)遗传图解:(3分)bbBb雄果蝇雌果蝇配子Fbb文字说明:子代Bb和bb各占12,其中Bb的个体雌雄各占2,bb的个体均为雄性,故子代雌:雄=1:3

【参考范文】One day, Spotty returned from his daily walk with a broken leg. Appearing exhausted, he came to myroom and sat near me, the leg bleeding. I called my mother and she quickly tied a bandage around his leg andgave him food to eat. I was very upset. But the next day, Spotty followed me wherever I went happily asusual though he limped a bit. After this incident my relation with Spotty became more intense. I reallyadmired him a lot for his courageAlmost a year later, one midnight we heard Spotty barking breathlessly. We rushed out and saw himbarking continuously, heading somewhere. After some time Spotty became quiet. I patted him on his backand came inside. The next morning, my heart skipped a beat when I didn't see Spotty. I searched for him ineach and every corner but in vain. And this time he had gone and would never come back. I cried and waitedfor him. But there were no signs of him and I only say him looking at me with his sparking eyes in my dream

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