英语周报2021-2022外研版高三xb16答案

24.(12分,每空2分)(1)实验思路取腿部有斑纹的雌、雄果蝇与腿部无氵斑纹雌、雄果蝇,进行正交和反交(即有斑纹早×无斑纹,无斑纹早×有斑纹),观察后代的性状氵表现预期实验结果及结论:I,若正、反交后代性状表现致,则该等位基因位于常染色体上Ⅱ.若正、反交后代性状表现不一致,则该等位基因位于X染色体上(答案合理即可)(2)实验思路:取腿部有斑纹雄果蝇与腿部无斑纹雌果蝇杂交,观察后代的性状表现预期实验结果:雌蝇全为有斑纹、雄蝇全为无斑纹实验结论:腿部有斑纹性状是显性性状【解析】解析见参考答案

Paragraph 1Several days later, when Jenny's father came in toread her a story, Jenny was waiting anxiously for him on thebed. When listening to the story Jenny was totally absentminded, with her hands holding the necklace tightly andfirmly. When the story came to an end, unexpectedlyJenny offered her beloved necklace to her father, with herfingers trembling automatically. No one knew what thenecklace meant to her. She whispered to her father, softlyand gently, "Daddy, you know I love you more than thenecklace. "Then the necklace slid into her father's handsdeterminedlyParagraph 2Holding the plastic pearl his daughter offered, thefather dragged out a blue box. Much to Jennys amazement, a beautiful real pearl necklace lay peacefully in thebox, which set her heart racing. Jenny froze there,athrilled expression twisting her face. Before Jenny was ableto say something, her father brushed a warm kiss on herface and gathered her into his arms. Holding the genuinenecklace in her hand, Jenny lifted her lip, tears beginningto blur her vision

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