Genetic drift

This is one form of a process that biologists call genetic drift .

这是生物学家称之为遗传偏移的一种方式。

Scientists have found another kind of genetic drift in neutral traits .

除此而外，科学工作者还发现中性特征方面的另外一种遗传偏移。

The result shows that genetic drift has a strong effect on the loss of genetic diversity .

结果表明，圈养大熊猫群体规模小，漂变是导致遗传多样性丢失的主要因素。

The differences probably due to a limited number of introductions and genetic drift .

这些差异可能由于有限度的引种和遗传迁移。

Genetic drift from conventional crossover and recombination operators , is analyzed theoretically .

以广义交叉算子为对象，研究重组的遗传漂移现象。

Genetic drift reduces diversity in populations more quickly than mutation can introduce it .

遗传漂变减少人口差异的速度比变异要快得多。

Genetic drift analysis of generalized crossover

广义交叉的遗传漂移分析

Cultural drift is a process roughly analogous to genetic drift in evolutionary biology .

文化漂变是一个与进化生物学中的遗传漂变大致类似的过程。

Another possible reason of high differentiation , could be from the reduced population size that induced the genetic drift .

另外，也可能是在其进化过程中，由于居群的缩小而发生了遗传漂变。

Genetic Drift Analysis of Recombination

重组的遗传漂移分析

Whether speciation is achieved normally via genetic drift or natural selection is the subject of much ongoing discussion .

究竟正常的物种形成是通过遗传漂变还是通过自然选择达到的，是现在正在进行热烈讨论的话题。

Simulation of Genetic Drift in Closed Population under Different Initial Gene Frequencies Book a holiday , possibly white-water rafting .

不同初始基因频率下闭锁群体遗传漂变的模拟预定假期，比如白水漂流（即漂流）。

Effect of Age Structure of Inbreeding and genetic Drift in animal Populations Simulation of Genetic Drift in Closed Population under Different Initial Gene Frequencies

年龄结构对群体近交遗传漂变的作用不同初始基因频率下闭锁群体遗传漂变的模拟

More intense effect of genetic drift than selection leaded bigger genetic differentiation among generations than that between two host populations , 3 .

遗传漂变的作用大于选择压力而使同种寄主不同世代种群间的遗传分化更大。

The gene flow ( Nm ) . was 0.4683 , suggesting that genetic drift between populations caused local genetic differentiation and therefore , population divergence .

基因流（Nm）为0.4683，说明群体间遗传漂移引起了当地遗传差异及群体分化。

The reasons may be that the excursion occurred in random mating , the random genetic drift and breeding was existed in 6 populations .

究其原因有随机交配发生偏移、遗传漂变及选择等因素，其中选择所造成的影响最大，其次为随机交配发生的偏移以及遗传漂变。

They accumulate mutations in their DNA by a process known as genetic drift and there are few selection pressures around to curb these mutations .

它们通过一种称为遗传漂变（geneticdrift）的过程积累它们的DNA的突变，而且几乎没有抑制这些突变的选择压力。

Experimental results show that genetic drift induced by occurrence-based scanning crossover reduces both convergence rate and genotypic diversity , thus causing pure performance deterioration of evolutionary search .

实验数据表明，重组的遗传漂移只会产生降低收敛速度和收敛可靠性的纯消极效果。

This might be due to the continuous , oriented selection for the flowering traits and might also be due to the genetic drift induced by selection intensity and effective population size .

这可能是由于连续对开花期性状定向选择的结果，也可能还与群体有效含量和选择强度引起的遗传漂变有关。

Minimizing the genetic drift in fertility was key to the purification and reproduction of thermo photo sensitive genic male sterile ( TPSGMS ) lines of wheat .

最大限度控制育性的遗传漂移，是小麦温光敏核不育系提纯中要解决的主要问题。

Accounting for expense on regeneration and potential threat form genetic drift , we suggested that viability standard of regeneration threshold should not be too low ( 80 % may be referenced ) .

考虑到繁殖费用和遗传漂移的潜在威胁等因素，建议基因库大豆种质繁殖更新的生活力标准不要大低（以80%为宜）。

Based on FST , mean gene flow Nm is about 7 . 3 . Nm > 1 , it is enough to resist the effect of genetic drift and prevent population from subdivision .

基于FST，间接估计基因流（Nm）值约为7.3。Nm＞1，说明基因流足以抵制遗传漂变的作用，也同时防止了居群分化的发生。

We proposed that the migration and mixing are the dominant driving force of the HLA gene flow while the genetic drift caused by isolation and the nature selection have an important influence on HLA genetic structure .

认为群体迁移、融合而产生的基因流动是HLA基因频率变化的主要动力，但隔离导致的遗传漂变以及自然选择也有重要影响。

The high intrapopulation variation and low interpopulation differentiation could explained that the different populations might originate from the same one and genetic drift or inbreeding depression had not influenced primary process of genetic diversity .

四合木种群较高的遗传多样性和极低的种群间分化，说明不同的种群可能有共同的起源，随机遗传漂变和近交衰退不是影响遗传多样性的主要过程。

There is a close relationship between TE and population dynamics , natural selection , and genetic drift . TE can make the host to get new function , meantime may get lost from the host even the extinct of population or species .

转位因子与居群动态、选择和遗传漂变等密切相关，它可以使宿主获得新的机能，同时也可从宿主中丢失，甚至使居群或物种绝灭。

This paper introduces the types of transgenic plants , and analyses the tendency of transgenic plants to grass , the possibility of genetic drift and heterogenetic recombination in virus , the evolutionary relations of transgenic plants with other organism .

介绍了目前转基因植物的类型，分析了转基因植物的杂草化倾向、基因漂流和基因异源包装的可能性及转基因植物与其他物种间的演化关系。

By analyzing topology of fitness landscape and extending the space for searching similar individual , clustering crowding can determine the locality of search space more accurately , thus decreasing the replacement errors of crowding and suppressing genetic drift of the population .

通过分析适应值曲面的拓扑结构和扩大相似个体的搜索范围，聚类排挤可确定搜索空间的局部性，减少排挤的替换错误并抑制种群的遗传漂移；

By analyzing the frequency of dominant allele , it is proved that diagonal crossover and uniform scanning crossover do not cause genetic drift , but occurrence-based scanning crossover induces strong genetic drift that deteriorates with the number of parents increasing .

通过基因频率分析，证明了对角交叉和均匀扫描交叉不会引起遗传漂移，但基于基因频率的扫描交叉可导致遗传漂移，其程度随重组规模的增加而加剧。

It is important to decide how to rejuvenate reduced mutation accumulation of stored seed , and counteracted the genetic changes by drift , fitness selection and contamination with alien pollen or seed that may occur during regeneration .

降低贮藏种子基因突变的累积效应，控制种质资源繁殖更新过程中由于遗传漂变、选择和污染所引起的遗传改变，对制定科学的种质资源繁殖更新策略十分重要。

The simulant genetic optimization shows that the genetic drift induced by multi-parent occurrence-based scanning crossover reduces both the population diversity and the convergence rate , thus deteriorating the performance of an evolutionary search .

应用基于基因出现频率的多父代扫描交叉的仿真遗传优化实验的数据表明，重组的遗传漂移不但导致种群多样度的急剧下降，而且降低了进化搜索的收敛速度，从而降低了进化搜索的性能。