tetrad

英 [ˈtet.ræd]      美 [ˈtet.ræd]
  • n. 四个;四个一组;[生物] 四分染色体;四价元素
tetrad
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tetrad (n.)
"the number four, collection of four things," 1650s, from Greek tetras (comb. form tetrad-) "group of four, number four" (see tetra-).
1. 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.
2. Microspore abortion occurred after the tetrad formation.
小孢子败育发生在四分体形成以后.
3. Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形, 合点端功能大孢子发育成为蓼型胚囊.
4. Cytokinesis was simultaneous and the arrangement 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.
5. The characteristics of tetrad was that the nucleus and Golgi bodies being in the active state.
四分孢子的显著特征是细胞核和高尔基体呈活跃状态.

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