异倍体

If operate as per production regulation,qualified non-polluted agricultural products can be produced.4 The detection rate of r-BHC in the grain is 24.0%,which is within the range of standard,other BHC isomers are not detected;No BHC in vegetables;No DDT in grain and vegetables;The total detection rate of 4 types of organic phosphor pesticides is 31% in the grain and vegetables,within which the content of dichlo rovinyldimethy 1 phosphate and dimethoate is a little bit higher than the standard,but the content of Baytex and Sunithion is lower than the staneard.5 The heavy metal detection rate in the grain and vegetables are stated respectively as following:Arsenic:none,none; Chrome:8%,72.4%; Lead:6%,13%;Cadmium:none,none; Hydrargyrum :none,none.

粮食中γ一六六六的检出率为24.0％，未出现超标现象，其他六六六异构体均未测出，蔬菜中六六六未检出，粮食和蔬菜的DDT未检出；粮食和蔬菜中的四种有机磷农药总检出率为31％，其中敌敌畏、乐果出现个别超标现象，倍硫磷和杀螟松未出现超标现象。 5、重金属在粮食和蔬菜中的检出率分别是：砷：未检出、未检出，铬：8％、72.4％铅字6％、13％，镉：未检出、未检出，汞：未检出、未检出。

Alternatively, like allopolyploids, they may arise by the nondisjunction of chromatids during the mitotic division of a zygote.

与异源多倍体相似的是，它们也是在有丝分裂中合子的染色单体不分离形成的。

They are often morphologically distinct from A chromosomes, being smallerand more highly heterochromatic in most cases. B chromosomes do not pair with Achromosomes, and they are inherited in a non-Mendelian way, exhibiting meiotic andmitotic instability and nondisjunction. However, B chromosome DNA is quiteidentical to the corresponding sequence on the A chromosome complement. So far afew B chromosome specific DNA sequence have been identified. Specific DNAsequences on B chromosome have been the attractive research area on Bchromosomes.

现已在千余种植物和近三百种动物中被发现。B染色体与物种中正常染色体不同：独立于整倍体基因组之外，减数分裂时不与A染色体发生联会和配对，细胞分裂后期不分离，非孟德尔遗传，富含异染色质，不含对宿主主要性状有影响的基因等。B染色体DNA的分子组成既与A染色体极为相似，具有A染色体DNA分子组成的一般特征：富含重复序列和转座成分，染色体三大功能组件DNA高度同源；又与之相区别，含有B染色体特异的DNA序列，这些DNA序列可以为探讨B染色体的起源和进化提供有价值的信息。

Allopolyploidization is a general tendance of evolution in crop.

异源多倍体化是作物进化的总趋势。

Transgenic triploid fish can be produced in large scale by crossing transgenic allotetraploid fish with transgenic diploid fish.

湖南师范大学生命科学学院成功的研制了雌雄可育的异源四倍体鲫鲤，并已成为一个种群。

We used triticale which was the allopolydroid of wheat and barley as the brewing beer material.

首次采用了小麦与黑麦属间异源多倍体杂交品种——小黑麦作为酿造啤酒原料。

By using genome in situ hybridization on root somatic chromosomes of allotetraploid derived from the cross Gossypium arboreum × G.

然而，仅依据形态学和普通的核型图像，还不能确定该异源四倍体棉种中比克氏棉G染色体组在核型中的表现。

In this study,Amplified fragment length polymorphism analysis was carried out by using 23 pairs of EcoRI-NN/MseI-NNN selective primers in amplification of the DNAs from reciprocal F_1 hybrids of Cucumis hystrix Chakr.and C.

为了研究细胞质背景对基因组序列丢失的影响，利用23对Eco RI-NN/Mse I-NNN选择性引物对Cucumishystrix与栽培黄瓜C.sativus的正反交F_1、异源双二倍体及亲本DNA进行AFLP分析。

The morphological observation showed that the two monosomic addition lines could form head normally, but the characters existed difference between the addition- lines and diploid parent.

对2个单体异附加系的植株形态学性状进行了初步观察，结果显示2个附加系均能正常结球，但球形的形态与二倍体结球甘蓝存在明显差异。

Besides off-column preconcentration, on-column preconcentration method has been attracting a lot of researchers because of its simplicity.

采用同样的装置，本论文首次建立了毛细管电泳分析血浆中的维甲酸异构体的方法，灵敏度提高100倍以上。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。