Kyrotype of synaptonemal complex in meiotic pachytene showed that relative length proportion of 1st bivalent and 31st was more than 2. From 6th to 26th, the relative length variability of adjacent two bivalents was less than 4%.

• 粗线期SC中，1号与31号SC相对长度之比大于2，在6-26号SC之间，相邻的两条SC长度差异均不超过4%25。