二分体

属于或关于二分体，或以二为基础。

Of or relating to a dyad or based on two .

结果形成二分体胞子。

As a result , dyad spores formed .

经二分体和三分体的发生频率估算出的2n花粉频率与当年以花粉直径为指标测得的2n花粉的实际发生频率基本一致。

The frequency of 2n pollen production predicted by frequencies of dyads and triads agreed with that estimated by pollen diameters .

四分体时期观察到二分体和三分体。

Dyads and triads were produced at tetrad stage .

四分体时期出现二分体、三分体、含微核的异常四分体及多分体。

At tetrad stage , dyad , triad , tetrad with micronucleus and polyad appeared .

研究结果表明迭代阈值分割和彩色分割算法能正确地分割二分体图像，距离求索法能够对拐点正确提取，进而确定特征点。

The results indicate that the repeatedly threshold segmentation and color segmentation algorithms could segment the half carcass image ;

二分体、三分体、四分体时期，胼胝质荧光主要存在于大孢子之间的横壁上，侧壁内胼胝质荧光较弱。

Callose exists mainly in transverse walls during dyad , triad and tetrad stages , a little in side walls .

减数分裂末期，往往出现两个落后染色体，最终产生染色体数为20+20的二分体。

Two lagging chromosomes were often found at Anaphase I and a dyad with equal chromosome number of 20 + 20 were formed at Anaphase I.

二分体和功能大孢子具类似的微管分布，而在单核胚囊微管主要是随机分布，部分呈辐射状。

The pattern of distribution of the microtubules in the two and four-nucleate embryo sac was quite similar and the microtubules were mainly of the perinuclear type .

合点端的二分体细胞中细胞器丰富，线粒体和质体的形态正常，表明完成了再分化。

The chalazal cell in the dyad contains many organelles , and mitochondria and plastids showing regular shapes , considered a sign of the end of redifferentiation .

从花粉母细胞到二分体经过2-3天时间，二分体到四分体约24小时，四分体到花粉粒约3天左右。

It took 2-3 days from pollen mother cell to binary , 24 hours from binary to tetrad , and 3 days from tetrad to grains of pollen .

二氯苯同分异构体及1,2,4-三氯苯体系固液平衡测定

The Measurement of Solid-Liquid Equilibrium For Dichlorobenzene Isomers and 1 , 2 , 4-trichlorobenzene Systems

结果表明：同源三倍体SAR-3花粉母细胞减数分裂中期染色体形成单价体、二价体和三价体；后期染色体分离遵守随机分配规律，但有一定比例整倍性二分体出现；

The results showed that the univalent , bivalent and trivalent were observed at metaphase ⅰ, but the chromosome segregation was random at anaphase ⅰ .