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.
终变期末有些二价体的同源染色体只在末端连在一起。
Diakinesis bivalents end of some of the homologous chromosomes together only at the end.
与期望染色体配对模式相比，双二倍体中二价体出现的频率有明显增大的趋势。
Frequencies of bivalents in the amphidiploids tended to increase obviously in comparison with the expected chromosome pairing model of the meiosis.
与期望染色体配对模式相比，双二倍体中二价体出现的频率有明显增大的趋势。
Frequencies of bivalents in the amphidiploids tended to increase obviously in comparison with the expected chromosome pairing model of the meiosis.
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