查询词典 heterosis

Cabbage belongs to colewort of cruciferae, a variety of Brassica oleracea L. The heterosis of cabbage is very apparent.

结球甘蓝(Brassica oleracea.var.capitata L)属十字花科芸薹属甘蓝的一个变种。

Heterosis of eight agronomic important characters of F 1 derived from different ecological types in japonica rice and combining ability of their parents were studied by an 8×8 diallel design.

用 8个不同生态类型的粳稻品种配成 8× 8双列杂交，研究 8个重要农艺性状的杂种优势以及亲本的配合力。

Sixty-two varieties were used to analysis the heterosis of the Fl hybrids, which were created in a diallel set of cross between 9 ecological types.

利用9个不同生态类型的62份水稻亲本材料，以生态型为单位进行双列杂交，配制988个组合，研究杂种一代的对照优势和超中亲优势。

The main results are as followings:1 Molecular mechanism analysis of the rice heterosis by functional genomics method.1.1 In five gene chips, 845 genes that are discrepantly expressed were found.

研究结果如下： 1 运用基因芯片对水稻杂种优势分子机理的解析： 1.1 5张基因芯片检测出845个差异表达基因，涉及多种植物功能，表明杂种优势的表现与多种代谢途径相关。

These genes are related to many plant functions, indicating that the heterosis was related with many metabolization pathways.1.2 The quantity of discrepant genes showed that the genetic discrepancy was notalways the same with the discrepancy of expressed genes, indicating that small-scale genetic discrepancy maybe result in large-scale genes discrepantly expression; in other way, some genetic discrepancies might not embodied on the discrepant genes in the experiment.1.3 Nine and eight discrepant genes were found respectively in the superior bulkand minor bulk in the dominant level.

1.2 各张芯片差异表达基因数量表明遗传差异与表达谱差异不尽一致，可能较小的遗传差异可以造成表达谱的巨大改变，而有些遗传变异可能没有在表达谱上表现出来。 1.3 从优势集团和负优势集团中分别找到9个和8个具显性表达水平的差异表达基因，研究表明显性表达水平的差异表达基因的聚合与杂种优势的表现没有相关性。

Heterosis, Genetic variance and Physiological Energetics of Third Selected Pearl Oyster, Pinctada martensii Dunker

列印前，可以使用&档案&功能表中的&预览列印&进行列印效果预览，然后再进行列印

The epistatic effects could not be ignored in tobacco breeding.They were one of main causes of heterosis for most characters.

互作效应普遍存在，是烟草性状杂种优势表现的主要原因之一。

This course systematically describes the structure and function, transmission, expression and regulation, and evolution of genetic materials, covering basis of cytology for inheritance, molecular basis of genetic materials, Mendel's principles of inheritance, linkage and sex linkage, genemutation, variations in chromosome structure and number, quantitative genetics, inbreeding and heterosis, inheritance of bacteria and viruses, extranuclear inheritance, gene engineering, genomics, gene expression and regulation, developmental genetics, population genetics and evolution.

本课程全面系统地介绍遗传物质的结构与功能、遗传物质的传递、遗传物质的表达与调控、遗传物质的进化等，包括遗传的细胞学基础、遗传物质的分子基础、孟德尔遗传、连锁遗传和性连锁、基因突变、染色体结构变异、染色体数目变异、数量性状的遗传、近亲繁殖和杂种优势、细菌和病毒的遗传、细胞质遗传、基因工程、基因组学、基因表达的调控、遗传与发育、群体遗传与进化。

Maize germplasm gets more and more mixed. To make full use of heterosis, it is very important for maize breeders to distinguish heterotic groups and to design heterotic patterns.

玉米种质日趋复杂，对现有种质资源进行杂种优势群的划分，构建杂种优势模式的基本框架，将对进一步提高杂种优势利用水平，对当前和今后的玉米育种工作有重要的指导意义。

The principles of several DNA Molecular markers and their application on assessment of germplasm genetic diversity, fingerprinting construction, classification of heterotic groups and heterosis prediction for maize were reviewed.

DNA Molecular markers ； DNA分子标记是继形态标记、细胞标记和生化标记之后发展起来的一类重要的遗传标记，已在生命科学领域中广泛应用。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。