查询词典 bivalents

The cytogenetics of interspecific hybrids among the four cultivated cotton species were studied in this paper and results are as follows: The diploid interspecific hybrid (G. arboreum×G. herbacium) F〓 had a four-chromosome-ring at the meiotic metakinesis. The synapses of tetraploid hybrid (G. hirsutum ×G. barbadense) F〓 was found to be regular, which mainly formed bivalents, sometimes some univalents, multivalents and chromosome bridge.

四个栽培棉种间杂交种F〓的细胞学观察结果表明，F〓减数分裂中期Ⅰ，形成一个环状四价体，直接证明了亚洲棉与草棉之间存在一对相互易位；F〓减数分裂中期Ⅰ联会基本正常，主要形成二价体，偶尔出现一些单价体和多价体，以及染色体桥。

The results showed that: at metaphase I, the homoeologous chromosome pairing among different F1 hybrids ranged from 2.0 to 11.4 bi-valents formed by homoeologous chromosomes per pollen mother cell, and very few multivalents, and even very few bivalents were formed by two chromosomes within one genome rather than homoeologous chromosomes in some PMCs; at anaphase I, all biva-lents were disjoined and most univalents were divided.

结果表明在中期I阶段，这些杂种一代的近缘染色体联会变化很大，每个花粉母细胞中二价体形成的数目从平均2个到11.4个不等，甚至在某些花粉母细胞中，还发现极少的多价体和非部分同源染色体所形成的单基因组内二价体；在后期I时，所有的二价体分离，同时多数单价体也分离，分离的二价体和分离的单价体都移向两极，从而形成两组染色体；因为这时完整花粉母细胞中分离的二价体在两组染色体中总是对应出现，从而根据半二价体上染色体重组的位置可以分析在二价体的四分体时期发生在非姊妹染色体之间的多种染色体交换类型，如单交换、三线双交换、四线双交换、四线三交换和四线多交换。

The apparent advantages of mapping genes on bivalents have been discussed in detail.

此外，还讨论了在黄鳝二价体上开展基因定位研究的突出优点。

After the disintegration of the mid-Ⅰ membrane bivalents scattered in the cytoplasm.

中期Ⅰ核膜解体后二价体分散在细胞质中。

Each post-Ⅰ bivalents of two homologous chromosomes separate move poles.

后期Ⅰ每个二价体的两条同源染色体分开，移向两极。

A relatively high proportion of bivalents were formed in all tri-genomic hybridsfrom different combinations.

通过加倍获得三个不同来源的六倍体(分别表示为六倍体Ⅰ，Ⅱ，Ⅲ)，在细胞学观察的基础上以确认为六倍体的植株为母本与诸葛菜杂交。

And 91. 2% PMCs with 6-10 bivalents, 14.7%, 24.5%and 9.8% PMCs with univalents less than 8 respectively.

同时包含有少于8个单价体的细胞比例在组合间有较大的差异，分别为14.7％，24.5％和29.8％。

The bivalents were not homogeneously labeled with this technique and the extension signals were very apparent and relatively stable,and these can be applied to identify the individual bivalent.

其结果显示黄鳝二价体上DNA延伸效果十分明显，银颗粒基本上是非随机性的相间排列，而且主要特征是基本稳定的，据此可以进行染色体识别。

At metaphase Ⅰ, 7 bivalents were frequently detected to separate into three groups, with a form of 3+2+2, which indicated that at least four translocation events once occurred.

在中期Ⅰ，7个二价体出现分组分布现象，主要以3+2+2形式存在，表明其至少经历了4次染色体易位。

As the Federation of cell chromosome by a 2n of Article n of univalents into bivalents, although the DNA content remained unchanged, but the number appears to reduce by half.

由于联会，细胞中的染色体由2n条单价体成为n条二价体，虽然DNA含量未变，但数目看起来减少了一半。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。