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The result indicated that 237 combinations amplified a total of 13 079 AFLP fragments with an average of 55 fragments, the average of 1.30 markers per 1 000 AFLP fragments were found to be linked to clubroot resistant gene; the amplified polymorphic fragments were 3 167 between the two parents, account for 24 percent of polymorphic frequency; the number of amplified fragments and the number of polymorphic fragments was in positive linear correlation; GC content of AFLP primer combinations significantly affects the number of amplified fragments and the number of polymorphic fragments, indicating negative linear correlation between them.

结果表明：平均每个组合检测到55条带，共扩增13079条带，平均每1000条带检测到1.30个根肿病抗性基因连锁标记；多态性带数为3167条，双亲间多态性频率约为0.24；扩增带数与多态性带数呈线性正相关，引物组合中的不同GC含量与扩增带数和多态性带数存在显著性差异，并表现出线性负相关。

At polymorphic gene locus, the variance components of quantitative trait was described as follows:VA=2βp and VG=p′Xp-G2 in which p=column vector of polymorphic allele frequencies,β=row vector of2,X=［a2ij］i×i matrix,aij=genotype value,and G=population mean.

数量性状相对多态座位的加性方差和遗传方差分别为VA=2βp和VG=p′Xp-G2，其中p′和p分别表示多态等位基因频率的行向量和列向量，X表示以基因型值平方为元素的矩阵，β表示以基因均效平方为元素的行向量，G为群体均数。

The technique of RAPD was used in analysis of mele or female also. Eachprimer among amplified bands of DNA is of polymorphic at various levels, and63％ of DNA fragments amplified are of polymorphic.

应用RAPD技术分析绞股蓝雌雄株，在DNA的扩增位点中，每一个引物均显示出不同程度的多态性，扩增出DNA片段总共有63％个位点是多态的。

The results showed that: The number of loci detected in the German mirror Carp, Japanese crucian carp and F1 were 200、207、218, and the number of polymorphic loci were 63、66、72,and the percentage of polymorphic loci were 31.5%、31.9%、33% respectively. The percentage of polymorphic loci of F1 was considerately higher than that of the parents indicating the rather great genetic variations within the 3 populations.

结果表明：在德国镜鲤、日本白鲫、F1中检测到的位点数分别为200、207、218，其中多态性位点数分别为63、66、72，多态位点比例分别为31.5%、31.9%、33%。F1多态位点高于父母本，表明它的遗传多样性和变异水平最高。

Furthermore, I'll demonstrate a polymorphic finder query and a couple of polymorphic method calls.

此外，我将示范一个多态的 finder query 和一组多态的方法的调用。

The RAPD was used to study the genetic diversity of 19 KinXin series potato cultivars. The result showed that 52 RAPD bands were amplified using 7 primer, among them 43 bands were polymorphic, and 4~9 bands were amplified in each lane. The RAPD analysis indicated that the genetic distance of 19 potato cultivars was between 0.17~0.72, average value was 0.39. When all of the polymorphic bands were analysed by cluster analysis, 19 potato cultivars were classified into 3 groups. The analysis showed that there existed close sibship among the majority of potato cultivars, and the genetic distance between the minority cultivars and the others is longer, which indicate that the genetic basis of KeXin series potato cultivars is wide.

利用RAPD标记技术对19份克新系列马铃薯品种进行了遗传多样性分析，分别提取19份马铃薯品种的DNA，进行随机引物多态性扩增，从1000条随机引物中初步筛选出7条有多态性的引物进行详细研究，每条RAPD引物扩增出4~9条带，共获得52条带，其中多态性条带为43条；19份马铃薯品种的遗传距离介于0.17~0.72之间，平均值为0.39，平均遗传距离介于0.31~0.51之间；聚类分析结果在GS=0.53处可将克新系列马铃薯品种划分为三类，聚类结果与系谱分析基本相符，同时也说明克新系列马铃薯的遗传基础有所拓宽。

Using RAPD markers techonolgy analysed the genetic structure of populations and built up the reaction system of SSR markers of Aristida pennata, at the same time, analysed the genetic structure based on SSR markers techonolgy. The research results are as follow:(1) 11 amplifiction random primers were used to detecte 125 loci in 76 samples. The total proportion of polymorphic loci of. Aristida pennata is 96.8%, the average proportion of polymorphic loci of Aristida pennata is 45.3%. The analyses of Shannon diversity index (1,0.5151) and Nei gene diversity index(h, 0.3471) indicate that the gene variation is rich in subpopulations.

Pennata.tirn为研究对象，在阜康，147团及121团周边等7个亚种群采集76个样品，通过RAPD分子标记技术进行亚种群内和种群间的遗传变异分析，并采用SSR技术建立羽毛三芒草的检测技术平台同时进行遗传结构分析，结果表明：(1) 11条RAPD引物检测到76个样品有125个位点，总多态位点百分比为96.8％；亚种群内平均多态位点比为45.3％，香农表型多样性指数(1，0.5151)，Nei's基因多样度指数(h，0.3471)都说明羽毛三芒草种群有较为丰富的遗传变异。

Random amplified polymorphic DNA markers were used to measure genetic diversity and genetic structure of 3 natural populations of Carya dabieshanensis 238 loci were identified by 20 RAPD primers, out of which 162 loci were polymorphic and accounted for 68.1% of the total genetic diversity at species level.

利用RAPD分子标记技术检测了大别山山核桃3个天然居群的遗传多样性和遗传结构。20条10bp随机引物共检测到238个扩增位点，其中多态性位点162个，多态位点百分率为68.1%。

Majority of polymorphic sites and informative sites of Cyt b 433bp sequences of mirid bugs are located on the 3〓 site of triplet code, average 69. 09% of total polymorphic sites. The second number on the 1〓 site, averages 23. 64%. The 3〓 site is the most conservative one. The polymorphic site on this site averages only 7. 27%. Distrabution of the informative site is also under the same rule. Informative sites on the 3〓, 1〓 and 2〓 site of the triplet code average respectively 62. 85%, 22. 86% and 14. 29% of the informative sites.

盲蝽科昆虫Cyt b 432bp序列的多态性位点和信号位点大多数位于三联体密码子的第三位点，平均占总变异位点数的69.09％，其次是在第一位点，平均占总变异位点数的23.64％，第二位点最为保守，平均只占总变异位点数的7.27％，信号位点的分布规律也是如此，第三、第一、第二位点上信号位点所占平均比例分别为62.85％，22.86％和14.29％。

Methods The genomic DNA extracted from the 2 trematodes was amplified with random amplified polymorphic DNA and then was carried on agarose gel electrophoresis.

应用随机扩增多态性DNA（Random amplified polymorphic DNA，RAPD）技术对斯氏肺吸虫和华支睾吸虫的基因组多态DNA进行扩增，扩增产物经琼脂糖凝胶电泳后分析结果。

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。