晚偶线期出现染色体互锁现象；
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.
偶线期时，以同源染色体活跃的、特定的配对(联会)为特征，形成了单倍数的二价染色体。
Synapsis (pairing) the association of homologous chromosomes during the prophase stage of meiosis that leads to the production of a haploid number of bivalents.
花粉发育过程做了超微结构观察。结果表明，在花粉母细胞细线和偶线期，核糖体数量减少、线粒体结构简化；
The results showed that the mother pollen cells presented decreased ribosome numbers at leptotene and zygotene stages, and simplified mitochondria structure;
花粉发育过程做了超微结构观察。结果表明，在花粉母细胞细线和偶线期，核糖体数量减少、线粒体结构简化；
The results showed that the mother pollen cells presented decreased ribosome numbers at leptotene and zygotene stages, and simplified mitochondria structure;
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