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- parental ditype tetrad 亲代双型四分体
- non-parental ditype tetrad 非亲代双型四分子
- nonparental ditype tetrad 非亲代双型四分子
- ditype tetrad 二型四分子
- The micronuclei were not observed in tetrad stage . 四分体阶段有微核。
- The other cells of the tetrad undergo degeneration. 胚囊发育类型为单孢子蓼型胚囊;
- The microspores in tetrad stage showed tetrahedron structure. 小孢子四分体为四面体型。
- Which undergoes meitotic division and forms a linear tetrad. 由孢原细胞直接发育形成大孢子母细胞。
- Abnormal development was observed at tetrad and mature embryo sac. 在四分体和成熟胚囊时期观察到了异常发育现象。
- At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared. 四分体时期还出现二分体、三分体、含微核的异常四分体及多分体。
- The megaspore mother cell meiosis to form a linear megaspore tetrad. 大孢子母细胞减数分裂产生直线形大孢子四分体。
- The chalazal megaspore of a linear tetrad develops into a polygonum type sac. 四分体线行排列，合点端的大孢子发育为蓼型胚囊。
- The pattern of microspores in the tetrad period is of tetrahedron type. 小孢子四分体时期其排列为四面体型。
- In tetrad stage, the structures of tapetal cells begin to dissociate. 四分体时期，绒毡层细胞内部结构开始解体。
- There were micronuclei and tetraspores of various types in the tetrad stage . 四分体阶段有微核和不同类型的四分孢子群。
- One pair of homologous chromosomes resulting from the division of a tetrad during meiosis. 二分体一对由四分体在成熟分裂过程中形成的同源染色体
- At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad. 此时每条染色体由一对染色单体构成，这两条联合的染色体称为四分体。
- There is only one layer of parietal cells at the stage of sporogenous cell, megaspore mother cell and tetrad. 造孢细胞,大孢子母细胞和四分体时期,周缘细胞仅1层。
- Cytokinesis was simultaneous and the arra ngement of microspores in the tetrad was tetrahedral. 胞质分裂为同时型，四分体中小孢子排列呈正四面体形。
- The ovule is anatropous, bitegmious, crassinucellate.Megaspore tetrad is linear. 子房三室，双珠被，厚珠心，倒生胚珠。
