英语词源
- tetrad (n.)
- "the number four, collection of four things," 1650s, from Greek tetras (comb. form tetrad-) "group of four, number four" (see tetra-).
权威例句
- 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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