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rate of inbreeding
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  “rate of inbreeding”译为未确定词的双语例句
     The rate of population inbreeding was 13.14%. Average inbreeding coefficient was 82.13_x10~(-4). The rate of inbreeding in patients with cretinism accounted for 17.35%.
     为了探讨地方性克汀病的遗传因素,本文通过:(1)近亲婚配的调查,群体近亲婚配率为13.14%,平均近交系数82.13×10~(-4),克汀病患者近亲婚配率为17.35%;
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     This result indicated that apart fromconsidering the size of animal genetic resources conservation population and ratio offemales and males, the mating system and method of properiy selecting parents shouldbe adopted so as to decrease the rate of inbreeding in practice.
     这一结果显示,在动物和家畜遗传资源保存中,除了考虑群体大小和留种的雌雄比例外,引入交配设计并辅以适当的留种方式,可以有效减缓繁育群体近交系数的上升,从而达到推迟或者避免基因消失或固定的目的。
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     A dynamic selection rule was developed that maximizes the annual genetic response while constraining the rate of inbreeding per year to a predefined value in a population with overlapping generations and different number of age class between sire and dam.
     一种扩展的动态选择规则能够在公母畜间有不同的年龄组数目的世代重叠群体内约束年近交速率为一个预定义值,逐年最大化遗传反应。
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     This rule accounts for the animals in population with overlapping population should be divided into sex-age classes,and limits the increase of mean relationship of individuals in parent population, so,the mean rate of inbreeding of new progenies is controlled.
     该规则考虑在世代重叠群体中按性别-年龄分组,通过限制父母亲群体性别-年龄组的平均加性遗传相关的增加,从而限制新生后代平均近交系数的增加。
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     Those highlight the need to maximize the genetic diversity in base population,and to control the rate of inbreeding in selective breeding programs and wild resource protection.
     实验结果表明,在选择育种和种质资源保护过程中都应该保证基础群体遗传背景最大化,从而有效控制近交。
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  相似匹配句对
     The infection rate of AM.
     老感染区细胞间的菌丝顶端也可见泡囊形成。
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     The developmental rate of D.
     在盐度一定时,的发育速率随温度升高而加快;
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     The retention rate
     截留率随溶液pH值的升高而升高,能达到99%以上。
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     inhibitory rate;
     抑制率;
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     and the inbreeding of coaches exists.
     教练员群体的“近亲繁殖”。
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  rate of inbreeding
Factors responsible for the elevated rate of inbreeding among the professional/mercantile class and its secular trend are discussed.
      
The average effective population size was 15.35, which indicated a high rate of inbreeding (5.52%).
      
Inbreeding and extinction: Effects of rate of inbreeding
      
However, at the current low populationdensities, the subdivision may markedly furtherincrease the future rate of inbreeding.
      
Allowing reasonablemutation rates (μ = 10-4), thisimplies a long-term post-glacial effectivepopulation size of Ne ? 350,and a slow average rate of inbreeding ΔF? 0.15% per generation during the c.860 generations (9 500 years) of isolation.
      
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The theoritical results of systems of inbreeding have been discussed in this paper.The general formulae for the heterozygote frequencies.Inbreeding coefficients and the rates of inbreeding for systems of full sib.Alternative parent-offspring and unrestricted Parent-offspring mating involving a single autosomal gene substitution are derived by extrapolation from the change of the heterozygote frequencies of ensuing generations when the population in the initial generation is at equilibrium.These...

The theoritical results of systems of inbreeding have been discussed in this paper.The general formulae for the heterozygote frequencies.Inbreeding coefficients and the rates of inbreeding for systems of full sib.Alternative parent-offspring and unrestricted Parent-offspring mating involving a single autosomal gene substitution are derived by extrapolation from the change of the heterozygote frequencies of ensuing generations when the population in the initial generation is at equilibrium.These formula are different from what are described in the classical memoirs.By the new ones the evaluation of the parameters Ft.Ht and ΔFt given generation t can be made more easily.The limiting values of Ft and Ht for all of three sys- tems of inbreeding have been verified strictly.The exact limiting value of ΔFt for systems of full sib and alternative parent-offspring mating has been found.It is (2/((1+5~(1/2)))~2) and is the core of the rates of inbreeding of all generations.These rates of inbreeding fluctuate by the core up and down alternately and finally approach to it with the range going down each passing generation.

1.规则近交系统的近交系数及杂合体频率的变化规律在经典文献中被归结为一些世代递推公式,以此描述群体的遗传结构。这里,我们通过研究相继世代杂合体频率的变化与平衡的起始群体基因裂频率的联系,为常体的两等位基因位点,导出表达若干近交系统的杂合体频率,近交系数及近交率变化的通式。2.用本文中的公式可以简单地直接计得任一给定世代 t 的近交系数,杂合体频率及近交率,而不象经典公式需要依赖所求参数在以前世代的值。3.严密地求证了全同胞交配系统,交替型及无限型亲子交配系统的近交系数及杂合体频率的极限值。4.求得了全同胞交配系统及交替型亲子交配系统的近交率的准确极限值,它等于(2/(1+5~(1/2))~2)。5.研究了在全同胞交配系统及交替型亲子交配系统中,近交进程的精细变化。发现各世代的近交率以极限值(2/(1+5~(1/2))~2)为中心,左右摇摆,摆幅逐代减小而趋于该值。

In studying the genetic factors of endemic cretinism, we used four approaches. 1. Inbreeding investigation. The rate of population inbreeding was 13.14%. Average inbreeding coefficient was 82.13_x10~(-4). The rate of inbreeding in patients with cretinism accounted for 17.35%. 2. Chromosome analysis. Diploid in 19 healthy subjects was 97.72%. In 74 cretin cases, diploid was found in 93.82%. The karyotype in one of those was 47, XXX. 3. Dermatoglyphic studies in 16 patients with cretinism revealed expansion...

In studying the genetic factors of endemic cretinism, we used four approaches. 1. Inbreeding investigation. The rate of population inbreeding was 13.14%. Average inbreeding coefficient was 82.13_x10~(-4). The rate of inbreeding in patients with cretinism accounted for 17.35%. 2. Chromosome analysis. Diploid in 19 healthy subjects was 97.72%. In 74 cretin cases, diploid was found in 93.82%. The karyotype in one of those was 47, XXX. 3. Dermatoglyphic studies in 16 patients with cretinism revealed expansion of atd angle, abnormal palmar flexion crease and fibular loop or proximal arch of hallucal area was found higher than healthy subjects. As the hallucal arch rises, atd angle expands. 4. Pedigree analysis. The incidence of cousins of patients with cretinism was 3.15%-highest among grandfather-mother-and older brother-younger sister. In cousins of every degree, first degree cousins had the highest incidence. If parents had normal phenotype, their children’s incidence was 86.21%. If one of the parents had cretinism, their children’s incidence was 13.79%. We consider endemic cretinism is a disease with polygenic inheritance. Its heritability is 48%. Although environmental factor has an important role we should not neglect the genetic predisposition in its etiology. The disease may be caused by the combination of these two factors exceeding certain threshold intensity. Thus using“Inheritance-iodine deficiency”to interpret the etiopathogenesis of endemic cretinism is appropriate.

为了探讨地方性克汀病的遗传因素,本文通过:(1)近亲婚配的调查,群体近亲婚配率为13.14%,平均近交系数82.13×10~(-4),克汀病患者近亲婚配率为17.35%;(2)染色体检查,19例正常人二倍体占97.72%,74例克汀病患者二倍体占93.82%,其中1例为47,XXX:(3)克汀病手、足皮纹学16项指标的研究,atd角增大,异常掌屈纹和拇趾球部纹的腓箕形、近弓形出现率高于正常人,拇趾弓形纹出现率增高,足apd角增大;(4)家系调查,克汀病亲属患病率为3.15%,其中以祖父母和兄妹患病率最高,在各级亲属中,一级亲属患病率最高,父母双亲表现型正常,子女患病率为86.21%;双亲之一为患者,子女患病率为13.79%。分析结果认为:地方性克汀病是一种多基因遗传疾病,其遗传度为48%,这表明影响发病的环境因素起着比较重要的作用,而遗传因素更不能忽视,病理基因乃是本病发生的物质基础,两者结合超过了一定的强度或阈值,就会发生地方性克汀病,因此,本病用“遗传—缺碘”这一病因来解释比较恰当。

he effect of factorial and nested mating systems on the rates of inbreeding areconsidered for the animal breeding and genetic resounes conservation schemes. In thebreeding selection population, result showed that the new inbreeding for factorialmating system is less than nested mating system. Howevet, in the Fopulations ifcomplete random selecting Parents and restriction on the random selecting parents there are no differences of the new inbreeding for two mating systems.Under themating systems,the new inbreeding...

he effect of factorial and nested mating systems on the rates of inbreeding areconsidered for the animal breeding and genetic resounes conservation schemes. In thebreeding selection population, result showed that the new inbreeding for factorialmating system is less than nested mating system. Howevet, in the Fopulations ifcomplete random selecting Parents and restriction on the random selecting parents there are no differences of the new inbreeding for two mating systems.Under themating systems,the new inbreeding for restriction on the random selecting Parents isless than complete random selecting parents.This result indicated that apart fromconsidering the size of animal genetic resources conservation population and ratio offemales and males, the mating system and method of properiy selecting parents shouldbe adopted so as to decrease the rate of inbreeding in practice.

探讨了因子和巢式交配设计群体近交率的形成机理,结果表明,这两种交配设计群体结构本身并不导致其近交率累积的差异。在育种选择情况下因子交配设计比巢式设计群体的近交率上升慢,而在完全随机留种和限制随机留种情形这两种交配设计对群体近交率的影响没有差异。但在交配设计情况下,限制随机留种比完全随机留种能有效地控制群体近交率的提高。这一结果显示,在动物和家畜遗传资源保存中,除了考虑群体大小和留种的雌雄比例外,引入交配设计并辅以适当的留种方式,可以有效减缓繁育群体近交系数的上升,从而达到推迟或者避免基因消失或固定的目的。

 
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