遗传的

The SCA effect was important in the heterosis of the spike number per plant of the intervarietal hybrid, the SCA and GCA were both important in the heterosis of the grain number of main spike of the intervarietal hybrid; the SCA effect played an major role in the heterosis of the spike number per plant of the interspecific crosses of the common wheat and club wheat, the SCA effect played an major role in the heterosis of the 1000-grain weight of the interspecific crosses of the common wheat and spelt wheat.

普通小麦品种间杂种每株穗数杂种优势中，特殊配合力所代表的非加性遗传效应起了主要作用，而主穗粒数杂种优势中一般配合力、特殊配合力所代表的加性、非加性遗传效应所起的作用相当；普通小麦与密穗小麦种间杂种主穗粒数杂种优势中特殊配合力所代表的非加性遗传效应起了主要作用；普通小麦与斯卑尔脱小麦间杂种千粒重杂种优势中特殊配合力所代表的非加性遗传效应起了主要作用。

The theory and the implementation of the genetic algorithms are discussed in detail. The question on how to choose the crossover probability, the mutation probability, the scale of population and the numbers of the generation is discussed. Then, the mathematics model of the optimal design is established. Exerting the finite element of elastic base beam and using FORTRAN to write the GAFORTRAN program. The program includes the common genetic algorithms and the modified genetic algorithms.

详细介绍了遗传算法的理论和实现技术，探讨了交叉概率、变异概率、群体规模、进化代数等变量的选取问题，建立起了基于遗传算法的深基坑支护结构设计的优化模型，结合弹性地基梁有限元法，利用FORTRAN语言编制了GAFORTRAN优化程序，程序中包括普通遗传算法和改进遗传算法。

It shows that the recent rapid decline on population and fragment of habitat leads to indigence in genetic diversity, and all three geographic units exhibits low levels of nucleotide diversity and haplotype diversity. The average genetic distance among all haplotypes was 1.32%, and the genetic variation within and between regions were 99.31% and 0.69% respectively.

结果发现，大鲵近期种群数量锐减和栖息地破碎化以及遗传漂变造成了大鲵遗传多样性的贫乏；三个地理单元均表现出较低的核苷酸多样性和单倍型多样性，各单倍型之间的平均遗传距离为1.32％，99.31％的遗传差异发生地理单元内，仅0.69％发生在单元间。

At the same time, to counter the problem that traditional coding method of genetic algorithm is difficult to design for this model, conventional genetic algorithm is modified by extending encoding method form digital string to matrix and defining corresponding genetic operator operation, this make encoding clear and understanding easy.

同时，针对遗传算法传统编码方案所存在的问题，提出了遗传算法的改进方案，将染色体结构由传统的数字串扩展到多维数组，并定义了相应的遗传算子操作，使得编码清晰、易于理解，遗传算子操作方便。

To investigate the origin, genetic structure and genetic relationship of Chinese sheep , Tan sheep , Sunite sheep , Diqing sheep , Gangba sheep , Langkazi sheep , Yuxi fat-tailed sheep , Inner Mongolian semi-fine sheep , Alety sheep , Duolang sheep , Fat-tailed han sheep , Jinzhong sheep and multi-horned Mongolian sheep were studied by using mtDNA.

为了进一步了解我国绵羊起源、群体遗传结构、群体遗传关系，本研究利用线粒体DNA标记分析了滩羊、苏尼特羊、迪庆羊、岗巴羊、浪卡子羊、豫西脂尾羊、内蒙古细毛羊、阿勒泰羊、多浪羊、大尾寒羊、晋中绵羊、蒙古羊羊等15个绵羊品种的遗传多样性和起源进化。

The taxon relationshops based on Nei's genetic identity and genetic distance were consistent with results obtained from karyotypic analyses.

Nei的遗传距离和遗传一致度进行的聚类分析基本符合传统形态学、细胞学等研究结果：即同属于斑腿蝗科的中华稻蝗和长翅素木蝗遗传距离最小( D = 0.559)，遗传一致度最高( I =0.576)。

It is one of the most dominant small mammals and plays an important role in keeping the balance of the alpine meadow ecosystem.The aim of this paper was to investigate the level of genetic diversity and also to test the hypothesis of IBD for this old species.Samples of plateau pikas were collected from four natural populations（Haiyan,Xidatan E,Xidatan W and Kunlunshan populations）.

采用多态信息含量、期望杂合度、观测杂合度、基因流和基因分化系数对种群及物种的遗传多样性水平进行分析；计算各种群间的遗传距离、遗传相似度以及遗传距离与地理距离的相关系数，并进行UPGMA聚类分析。

The genetic algorithm proposed in this paper is called pseudo parallel genetic algorithm, which is designed by author. This kind of search way improves the basic genetic algorithm.

本文用到的遗传算法是由作者自行设计的伪并行遗传算法，该算法是对基本遗传算法的改进，在收敛速度和全局搜索能力方面远远优于基本遗传算法。

Three methods to build soft-sensor model of Radial Basis Function neural network (K-means clustering algorithm, mixed Genetic Algorithm, mixed hierarchical Genetic Algorithm) is investigated and verified in simulation.In the condition of setting hidden layer's node numbers, K-means clustering algorithm and mixed Genetic Algorithm can satisfy online prediction of component content.

研究了三种建立RBF网络软测量模型方法(K-均值聚类算法、混合遗传算法、混合递阶遗传算法)，并进行仿真试验验证。K-均值聚类算法与混合遗传算法在预先设定隐含层节点数的情况下能满足组分含量在线估计。

One of the four DNA regions was the internal transcribed spacer on nuclear ribosomal DNA.

第一个遗传标记是ITS序列，ITS序列是双亲遗传，他能够检测到双亲的遗传特征和杂交现象。

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。