杂种优势

Crosses of the 13(15) crosses with higher protein content in kernel composed by parents from different heterotic groups, so the inbreds with high protein content and high combining ability from different heterotic groups was the genetic basis for making high protein crosses.

在子粒粗蛋白质含量相对较高的13(15)个组合中，92.3%(80%)组合的双亲来源于不同的杂优类群；因此，来自不同杂种优势类群的高蛋白、高配合力自交系是组配蛋白质含量较高组合的基础。

Heterosis is based on the heterozygosity of heterozygotic genotypes.

育种实践表明，杂种优势的遗传基础是杂交种基因型的杂合性。

The experiment aimed to explore the inheritance of BC1F3 to excellent characteristics of parents (Elymus dahuricus; Hordeum brevisubulatum), heterosis and fertility restoration.

［目的］探明BC1F3代对亲本优良特性的继承情况、杂种优势及育性恢复情况。

He parameters fitted with Richards indicated that T showed lower final weight and initial specific growth rate, and higher inflection point time. The hybridation of TD had greater heterosis in final weight, inflection point weight, initial spec

D产肉性能比T提高很大，尤其在高海拔，超过了双亲的性能，杂种优势很高。T心重率、肝重率、胃重率和单位体重小肠长度比其他品种高，胸肌剪切力性状变异较大。

For cooperation to the utilization of heterosis and the selection of "three lines" in crops by the people, we have studied the metabolic condition of "three lines" in Sorghum and rice with irradiant isotops.

配合群众性杂种优势利用及&三系&选育科学实验，应用放射性同位素对高梁及水稻&三系&植株的代谢情况进行了研究。

For cooperation to the utilization of heterosis and the selection of"three lines"in crops by the people,we have studied tbe metabolic condition of"three lines"inSorghum and rice with irradiant isotops.

配合群众性杂种优势利用及&三系&选育科学实验，应用放射性同位素对高粱及水稻&三系&植株的代谢情况进行了研究。

The heterosis use model mainly is the Kafir×kaoliang, the kaoliang×kaoliang, trend Kafir×trend kaoliang, the Shallu×trend kaoliang.

杂种优势利用模式主要是南非高粱×中国高粱，中国高粱×中国高粱，倾南非高粱×倾中国高粱，印度高粱×倾中国高粱。

So it is very necessary to study variances of Chinese Meretrix meretrix germplasm resources and their molecular genetic bases for their lasting utilization,sustained and healthy development of aquaculture industry. In this study, the genetic bases and their variances of representative populations of Meretrix clam were investigated through phenotypic traits and on the molecular level by quantitative genetic methods and molecular marker analysis technique.

本研究从表观性状和分子水平上探测我国文蛤种质资源的遗传基础和变异水平，旨在深入了解我国文蛤的种质状况并为其保护和可持续利用提供依据；在此基础上，通过杂交选择育种实践，分析和探讨文蛤由此获得杂种优势水平，为养殖文蛤的遗传改良和新品种培育提供理论指导。

Accordingly we start from the definition of heterosisH=F1-MP,where H is heterosis, F1 is the first generation offspring, MP is the mean of the parents or midparent, and from the use of a binomial random variable and its extention to the multinomial case derive the basic relations of heterosis with its components.

另一在原文中未加说明的原因是，用配合力概念需要无穷多个品系才能和遗传力的结果相比较，仅此一点就把配合力的作用排斥掉了。文中的主题是杂种优势老大难题可以用笛卡尔的推理方法来解决。

The equations of heterosis areV(subscript F1)=(l/2)Na^2+(l/4)Nd^2+Vsubscript I(F1additive dominance F1 epistasisV=(1/2)Na^2+(l/2)V1,additive parental epistasisV=(1/4)Nd^2+Vsubscript I(F1+(1/2)Vl,dominance F1 epistasis parental epistasis.where N is number of genes controlling a trait,α=P(subscript i-P/2, d is deviation from midparent, while the variance components are all indicated by their names under the repective terms.

由一个二项分布随机变数及其推广至多项分布推导出杂种优势的公式：V(下标 F1)=Na^2/2+Nd^2/4+V下标(F1加性显性 F1上位V＝Na^2/2+V/2加性亲代上位V＝Nd^2/4+V下标(F1+V/2显性 F1上位亲代上位在此N=控制性状的基因数，α=p(下标 i-P/2， d=离中亲的偏差，而各方差则如方程底部所列。

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％。