(人教通用版)2020版高考生物新探究大一轮复习第13讲减数分裂和受精作用课件.ppt

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第四单元 细胞的生命历程,第四单元 细胞的生命历程,有性生殖,成熟生殖细胞,一,两,一半,复制,蛋白质,2,四分体,交叉互换,赤道板,分离,自由组合,分裂,减半,分裂,染色体,加倍,一半,分裂,4N2N,联会,无,次级卵母 细胞,次级精母细胞 或第一极体,初级卵母细胞,卵细胞,精子,受精卵,细胞核,细胞核,染色体,染色体,精子(父方),卵细胞(母方),数目的恒定,减,如图3,减,如图2,减,如图5,有丝分裂,如图4,减,如图8,减 ,如图9,减,有丝分裂,减数第一次分裂前的间期,减数第二次 分裂的后期,前期和中期,减数,有丝,减数,有丝,

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