The chiasmata observed during the later stages of the meiotic prophase are cytological evidence of earlier cross-over events . 在减数分裂前期末所看到的交叉是在这以前发生了互换事件的细胞学证据。
In meiosis , the association of four homologous chromatids seen during the pachytene stage of prophase 减数分裂前期的粗线期中,四个同源的染色单体向联系形成的结构。
Synapsis ( pairing ) the association of homologous chromosomes during the prophase stage of meiosis that leads to the production of a haploid number of bivalents 联会(配对) :能产生单倍二价体的减数分裂前期,同源染色体的联合现象。