pachytene
基础科学

        In meiosis,the stage in mid-prophase I that is characterized by the con-traction of paired homologous chromosomes.At this point each chromosome consists of apair of chromatids,and the two associatedchromosomes are termed a tetrad.减数分裂中的中前期Ⅰ阶段。该阶段的特征是成对的同源......（本文共 268 字）     [阅读本文] >>