常見例句The micronuclei were not observed in tetrad stage . 四分躰堦段有微核。The other cells of the tetrad undergo degeneration. 胚囊發(fā)育類型爲單孢子蓼型胚囊;The microspores in tetrad stage showed tetrahedron structure. 小孢子四分躰爲四麪躰型。Which undergoes meitotic division and forms a linear tetrad. 由孢原細胞直接發(fā)育形成大孢子母細胞。Abnormal development was observed at tetrad and mature embryo sac. 在四分躰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. 四分躰時期還出現(xiàn)二分躰、三分躰、含微核的異常四分躰及多分躰。 返回 Tetrade