prophase

詳細解釋：

pro.phase

n.（名詞）
The first stage of mitosis, during which the chromosomes condense and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at opposite poles of the cell.
前期階：細胞減數分裂的第一個階段，其間染色體濃縮且能被看見，核細胞膜衰弱，紡錘體在細胞的相對紡錘極形成
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.
前期階：減數分裂的第一個階段，由一系列的事件組成，包括脫氧核糖核酸的複製，同種染色體結合、交叉，染色體形成以及染色體的收縮

【引伸】
propha.sic