查询词典 heterosis

The heterosis of grain hardness of interspecific hybrid between common wheat and spelt wheat or club wheat were usually negative except that of hybrid between common wheat variety Nongda 3226 and spelt wheat or club wheat.

普通小麦与斯卑尔脱小麦的种间杂种、普通小麦与密穗小麦的种间杂种的籽粒硬度均表现负优势，但农大3226所配的组合的籽粒硬度多为正优势。

The heterosis of spike number per plant and grain number of main spike were stable in the intervarietal crosses between years, and so were the grain number of main spike in the crosses of common wheat with club wheat, and were the 1000-grain weight in the crosses of common wheat with spelt wheat.

普通小麦品种间杂种每株穗数优势和主穗粒数优势年度间表现稳定；普通小麦与密穗小麦的种间杂种主穗粒数优势以及普通小麦与斯卑尔脱小麦的种间杂种千粒重优势两年均表现出明显的杂种优势，且幅度相近，其他性状年度间差异较大。

Utilization of heterosis is one of important and useful ways to promote crop output and quality.

杂种优势的利用是提高作物产量和品质的有效途径之一。

The second part is about animal breeding, including theory and method on animal breeding, such as selection and assess of breeding, breed method and essentiality of animal breed and animal strain, application of crossbreed and heterosis etc.

二、动物育种：研究动物育种理论和方法，了解种用动物的选择与评定，畜禽品种和品系的培育方法及重要性，杂交育种和杂种优势的应用等。

It was found that there was not an obvious correlation of the cumulation of differential expression genes with dominant expression level to the expression of rice heterosis.

分析表明，具显性表达水平的差异表达基因的聚合与杂种优势表现无明显相关性。

The heterosis in practice production was mainly used by hand emasculation and male sterility.

在生产上，棉花杂种优势利用主要是通过人工去雄杂交制种和利用棉花核雄性不育系杂交制种两种方法。

Heterosis making use of the male sterile breeding be able to save large amount of emasculation labour,ensuring that seed purity.It is possible that breeding can be solved while the trend of single tea varieties and genetic breeding the problem of insufficient resources.

利用雄性不育育种可以节约大量母本去雄的劳力，保证种子纯度，充分发挥杂种优势，同时可以解决育种中存在的茶树品种趋向单一化和遗传育种资源不足的问题。

However, We think that heterosis is caused by the complex effects of dominance, over-dominance and epistasis.

作者认为，杂种优势的产生是显性效应，超显性效应和上位性效应共同作用的结果，不可能只是一种基因效应在起作用。

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。

Furthermore, it was indicated that epistasis was the main genetic dynamics of speciation and adaption and the primary genetic component of heterosis and complex traits.

遗传物质间上位性是物种分化和适应的重要遗传学动力，也是复杂性状和杂种优势形成的重要遗传组分。

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％。