tetrad
英
美
网络 四分体; 四联球菌; 四联体; 四分子; 四分孢子
复数：tetrads
英英释义
noun
- the cardinal number that is the sum of three and one
双语例句
- First, we construct the symmetrized null tetrad from which the spin coefficients and Dirac equation are derived.
首先，构造对称化零标架，计算旋系数，导出Dirac方程，并对其进行化简。 - In the course of the embryonic development, after the microspore tetrad is formed, although some forms of the microspore were under developed, and lose of protoplasm, but some have formed normal microspore.
在胚胎发育过程中，小孢子四分体形成后，虽然出现有些小孢子形状不规则，原生质少或无等现象，但也有发育正常的花粉粒。 - Chromosomes out of nuclei can be seen both at prophase ⅱ and tetrad period.
前期Ⅱ和四分体时期可观察到核外染色体； - The pairing and segregating of homologous chromosomes at the frist and second division of meiosis were conformed with PMC meiosis, and finally, the tetrad were formation.
在减数第一和第二次分裂中，同源染色体的配对和分离基本正常，最后形成四分体。 - The tetrad analysis of some hybrids led the discovery of two complementary genes systems.
通过四分体分析发现一些杂种有两种互补基因系。 - Microspore abortion occured after the tetrad formation.
小孢子败育发生在四分体形成以后。 - The megaspore mother cell undergoing meiotic divisions produces a T-shaped, or, rarely, linear tetrad.
大孢子母细胞减数分裂产生T形四分体和少数线形四分体。 - The process of pollen abortion begins with vacuole formation and gradual enlargement in the tetrad.
花粉败育的过程从四分体开始，细胞质内液泡逐渐增大，接着细胞器解体，细胞核解体。 - 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。