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。
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Pachytene in meiosis , the stage in mid - prophase that is characterized by the contraction of paired homologous chromosomes 粗线期：减数第一次分裂前中期中的一个阶段，以配对同源染色体浓缩为特征。
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Pairing of homologous chromosomes ( synapsis ) commences at one or several points on the chromosome and is clearly seen during pachytene of meiosis i 同源染色体两两成对平行靠拢，这一现象也称联会，联会发生在染色体的一点或多点上，可以在减数第一次分裂的粗线期观察到。
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Rules : 9 9 large squares , each line and each must fill out 1 - 9 figures , be repeated no less ; pachytene each separated by a small preview , must also be filled 1 - 9 figures , the same can not 规则：在99的大正方形中，每一行和每一列都必须填入1至9的数字，不能重复也不能少在每个由粗线隔开的小九宫格中，也必须填入1至9的数字，同样不能重复也不能少。
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Rules : 9 9 large squares , each line and each must fill out 1 - 9 figures , be repeated no less ; pachytene each separated by a small preview , must also be filled 1 - 9 figures , the same can not enter the name of the game 规则：在99的大正方形中，每一行和每一列都必须填入1至9的数字，不能重复也不能少在每个由粗线隔开的小九宫格中，也必须填入1至9的数字，同样不能重复也不能少。
