2022英语周报8年级下答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

4D【解析】图示细胞处于减数第一次分裂前期且发生了交叉互换,该变异属于基因重组染色体结构未发生改变A镨误:图中姐妹染色单体上的等位基因的分离可以发生在减数第次分裂,B错误;若该细胞在减数第二次分裂时姐妹染色单体分开后移向同一极,可能产生基因型为Aabb或AaBB的细胞,C错误;在减数分裂过程中,组成四分体的4条染色单体将分别进入4个子细胞,因此该精原细胞能产生Ab、AB、ab、aB四种精细胞,D正确。

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