第四部分写作第一节短文改错Before the bemy familytakes me to an art exhibition. Seeing the creative art pieceswas done by children made me decided to take art classes.decideEvery week I spent two hours painting My teacher wasvery patience and kind. She ever told us how we shouldpatientpainL, but rather she let us learn and get inspiration forTonfamous paintings. Sometimes i didnt notice that thewhalpainting actually was until I finished it, which reallyhelped me express your feelings and relieve my stressVery soon I realized that it was A good decision. It reallyturned up to be a great way to relax after studyingout
(1)有丝后⑥(2)初级卵母细胞2①(3)同源染色体分离后,细胞一分为二着丝点分裂,姐妹染色单体分离②③④(4)AaB或b【解析】(1)据分析可知,甲细胞处于有丝分裂后期发生在图丙中的⑥阶段(2)据分析可知,乙细胞处于减数第一次分裂前期名称为初级卵母细胞;此细胞中含有2个四分体;基因B与b的分离发生于减数第一次分裂后期,对应图丙中的①阶段。(3)据分析可知,图丙中曲线①②阶段染色体数目减半,形成的原因是同源染色体分离后细胞一分为二曲线②③阶段染色体数目暂时加倍,形成的原因是着丝点分裂,姐妹染色单体分离;减数第二次分裂过程中不存在同源染色体,因此曲线中②③④阶段不存在同源染色体。4)若乙细胞在进行减数第一次分裂时,③和④没有离,减数第二次分裂正常,最终形成了四个子细胞,其中一个极体的基因型为AaB,若此极体与卵细胞来自同一个次级卵母细胞,则卵细胞的基因型是AaB,若此极体由第一极体分裂产生,则卵细胞的基因型为b。
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