2023义务教育教科书 八年级下册 英语周报第二十期答案

2023义务教育教科书 八年级下册 英语周报第二十期答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本网站。

29.D【解析】卵原细胞的基因型为TtMm,其产生的卵细胞的基因组成为TM,说明减数第一次分裂后期,含有基因T和基因M的非同源染色体组合到起,共同进入次级卵母细胞(基因组成为TTMM),而含有基因t和基因m的非同源染色体组合到起,共同进入第一极体(基因组成为ttmm)。次级卵母细胞分裂形成一个卵细胞(基因型为TM)和一个第二极体(基因型为TM),而第一极体分裂形成两个第二极体(基因型为tm)。因此减数第一次分裂产生的极体基因组成为mm,减数第二次分裂产生的极体基因组成为TM和tm两种,D正确。

(pq)One possible version:Dear AlanI can't wait to share with you the wonderful news--my class has won the championship of theschool basketball game!The final game was full of fierce competition between my class and our rival, Class 5, SeniorI. All the players were trying their best to score and block the opponent team. Though as anaudience, I couldn't compete on the court, as well as other classmates, cheered the loudest for ourteam. At last, we won the game by 52: 49, a narrow success. I felt so proud for my class and againfelt the true spirit of teamworkThis is my most inspiring news recently. How about yours? Looking forward to your schoollifeYouLi Hua

以上就是2023义务教育教科书 八年级下册 英语周报第二十期答案，更多英语周报答案请关注本网站。