The first stage of meiosis,constituted by a series of events that include DNA replication,the synapsis of homologous chromosomes,crossing over,the formation of chiasmata,and contraction of the chromosomes.是什么意思_The first stage of meiosis,constituted by a series of events that include DNA replication,the synapsis of homologous chromosomes,crossing over,the formation of chiasmata,and contraction of the chromosomes.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句