美[?t?t?r?d] 1 . At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad .
此時(shí)每條染色體由一對(duì)染色單體構(gòu)成,這兩條聯(lián)合的染色體稱為四分體.
來(lái)自《簡(jiǎn)明英漢詞典》
2 . Microspore abortion occurred after the tetrad formation.
小孢子敗育發(fā)生在四分體形成以后.
來(lái)自互聯(lián)網(wǎng)
3 . Megaspore tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分體為線形, 合點(diǎn)端功能大孢子發(fā)育成為蓼型胚囊.
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4 . Cytokinesis was simultaneous and the arrangement of microspores in the tetrad was tetrahedral.
胞質(zhì)分裂為同時(shí)型,四分體中小孢子排列呈正四面體形.
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5 . The characteristics of tetrad was that the nucleus and Golgi bodies being in the active state.
四分孢子的顯著特征是細(xì)胞核和高爾基體呈活躍狀態(tài).
來(lái)自互聯(lián)網(wǎng)
1.四聯(lián)體：四個(gè)類似或有關(guān)事物的組合，如四價(jià)元素(或基團(tuán))
2.四分體：染色體在第一成熟分裂前期的粗線期形成的4分組合
3.四裂體：某些球菌向兩個(gè)層面分裂形成的細(xì)胞方形物(八疊球菌)
1.四分體
2.四合花粉
1.四分體
1.四分體
1.四聯(lián)體
2.減數(shù)分裂I中，二價(jià)體具有四條染色體單體。
3.四分體
4.性母細(xì)胞減數(shù)分裂所產(chǎn)生的四個(gè)子細(xì)胞。
