双线期(diplotene stage）：前期I的第四个阶段，此期染色体长度进一步变短，联会复合体因发生去组装而逐渐消失，紧密配对的同源染色体相互分开，而在非姊妹染色单体之间的某些部位上，可见其相互间有接触点，称为交叉(chiasma)。
n. diplonema
misc. diplotene stage
前期可被分为连续的阶段：细线期、偶线期、粗线期、双线期和终变期。
Prophase may be divided into successive stages termed leptotene, zygotene, pachytene, diplotene, and diakinesis.
双线期时，配对的染色单体开始从四分体中分离，此时常可见染色体交叉。
In diplotene the pairs of chromatids begin to separate from the tetrad formed by the association of homologous chromosomes.
三峡双线五级船闸完建工程是三峡三期工程建设的重要组成部分。
The construction completion project of the Three Gorges two-way five-step ship lock is an important component of the Three Gorges Phase III project construction.
应用推荐