常見例句The micronuclei were not observed in tetrad stage . 四分體階段有微核。The other cells of the tetrad undergo degeneration. 胚囊發(fā)育類型為單孢子蓼型胚囊;The microspores in tetrad stage showed tetrahedron structure. 小孢子四分體為四面體型。Which undergoes meitotic division and forms a linear tetrad. 由孢原細(xì)胞直接發(fā)育形成大孢子母細(xì)胞。Abnormal development was observed at tetrad and mature embryo sac. 在四分體和成熟胚囊時期觀察到了異常發(fā)育現(xiàn)象。At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared. 四分體時期還出現(xiàn)二分體、三分體、含微核的異常四分體及多分體。 返回 Tetrade