遗传影响

Theory of genetic algorithm is studied , and the affect of genetic parameters to the evolutionary process is analyzed.

本文深入研究了遗传算法的机理，分析了遗传参数对进化过程的影响。

E. when selcetion is not favourable to Aa and aa, the fitness is smaller after fusion than that before fusion in sex-linded inheritance and no change in autosome inheritance. In overdominance, i.

无显性且为常染色体遗传时，群体融合对平均适应力无影响，而伴性遗传时导致平均适应力下降。

The contraction of genetic map using marker information and mapping QTL are the core of Statistical Genomics.

利用群体的遗传标记信息构建动植物的遗传图谱和定位分析影响数量性状的基因位点是统计基因组学的核心内容。

It is almost certain that genetic influences will be found, as will genetic covariance between entrepreneurship and other psychological traits.

几乎可以肯定的是，遗传的影响可以通过研究创业行为和其他心理特征的遗传协方差得以证明。

The aim of our study is to investigate the magnitude of the genetic determination of the peak bone mass (adjusted by gender, age, height, weight) at the spine and hip and their genetic covariation in Chinese.

本研究的目的是在中国人群中检测遗传因素对腰椎和髋部峰值骨质变异的影响大小，以及这两个骨质疏松性骨折高发部位骨质的遗传相关性。

In order to establish an efficent genetic transformation system with Cyclamen persicum leaves, several factors affected genetic transformation mediated by Agrobacterium tumefacien were studied.

利用根癌农杆菌介导法对仙客来叶片进行遗传转化，研究影响仙客来转化的若干因素，建立一套高效的遗传转化体系。

In this research, the ~ and F2 of the crosses between a natural mutant 慪34?with super-minute grain and 慪38?with super-large grain,慡huhui 881擲huhui 527?with middle grain size were carried out to study the inheritance of the grain shape (grain length, grain width, grain thickness and grain length/width ratio) and 1000-grain weight. The main results are summarized as below:? The F1 grain length, grain width, grain thickness and 1000-grain weight of three crosses were lay between the two parents and tended to Y34, which indicated that those grain traits were all governed by the dominant effect of Y34 and influenced by both female and male parents. The differences of F1 grain length, grain width, grain thickness and 1000-grain weight of positive and negative crosses between Y38 and Y34 indicated the existence of cytogene effects.? The broad heritabilities of major grain traits were calculated.

本研究利用一份水稻极小粒自然突变材料Y34与一份水稻极大粒材料Y38、两份常规籽粒大小材料蜀恢881、蜀恢527的杂交F_1及F_2，对主要粒形性状（粒长、粒宽、粒厚、长宽比）及千粒重进行了遗传研究，根据遗传研究的结果利用微卫星标记结合F_2群分法对控制Y34短粒性状基因进行了分子标记定位，主要结果如下：●各组合F_1粒长、粒宽、粒厚和千粒重介于双亲之间且明显偏向于小值亲本 Y34，这表明粒长、粒宽、粒厚和千粒重均主要受小值亲本显性基因的控制并同时也受大值亲本核基因的影响。Y34与Y38正反交F_1在粒长、粒宽、粒厚、千粒重等性状上存在差异，表明存在细胞质效应。

Keywords: genetic algorithm, binary decision tree, weight vector

并讨论了遗传算法的评价函数构造和编码方法，重点说明了如何对遗传算法进行改进，提高算法效率，然后分析了影响二元决策树错误分类率的因素，并用实例验证该方法构造的二元决策树对样本分类具有很高的辨识率

Finally,the information about QTLs and epistasis in the population provide strategiesfor manipulation of heterosis and improvement in hybrid rice.

最后，本文就上位性效应对杂种优势遗传研究和杂交水稻遗传改良的影响进行了讨论。

In addition, the accuracy of QTL mapping depends on the effect of putative quantitative trait loci and the value of heritability.

另外，性状遗传力和QTL效应的大小对QTL定位的准确度也有直接的影响，随着性状遗传力QTL效应的增大，两种方法QTL定位的效率均有不同程度的提高。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。