随机交配

Limited by the population and generations, the local search ability is not good. A new niche—Braham model is brought forward. In the Braham niche, the random mating mode between chromosomes is replaced by the mating mode based on the fitness of the chromosomes.

本文提出了一种新的小生境算子—婆罗门，将简单遗传算法中的随机交配改为根据染色体的适应度进行交配，提高了遗传算法局部搜索能力，有效地防止了基因漂移。

It is the differentia that three kinds of genotypes frequency of panmixia parts of common population are constant in every generation,but variable in selfing part.

不同的是普通群体随机交配部分的3种基因型频率在各世代是固定的量，自交部分的3种基因型频率是变量。

The "stemma equimultiple random select cross method" and "random mating method" were used to propagate offspring population of Langshan chicken. For each population, the pedigree of individuals were ascended up to 5 generations. Then, their generation increment of inbreeding coefficient was caculated using the regression slope rate.

以狼山鸡为素材，利用"家系等量随机选配法"和"随机交配法"2种保种方法进行继代繁殖鸡群，每个保种群每个世代的鸡只均逐只编制往上追溯5代的系谱图，利用回归斜率分析方法计算世代增量。

The research by compute r simulation analysed the possibility of long-time conserving heterozygote in co long.

本文运用计算机模拟的方法，在随机交配、随机留种的情况下，分析了群体中长期保存杂合子的可能性。

By the contrast between common population and inbreeding population, we know that the sameness of them are they all take the population for the synthesis of panmixia and selfing or inbreeding.

通过普通群体与近亲交配群体的比较，群体在非平衡条件下，普通群体与近亲交配群体相同的是都把群体作为随机交配和自交或近亲交配两部分的合成群体。

This pattern of genetic structure implies non-random mating and restricted gene flow among eels from different sampled locations, which therefore refute the hypothesis of panmixia.

这种遗传结构暗示非随机交配模式和不同区域样品间存在一定限制的基因流，因此否认了随机交配假说。

Tenth. A series of mathematical model of genetic mechanism of common population have been established,they are mathematical description of genetic mechanism of common population, so the population that the population genetics researching have extended from panmixia population, inbreeding population,selfing population to common population. It will start the new research territory of population genetics and promote its development.

本文建立了普通群体遗传机制的一系列数学模型，这是对普通群体遗传机制的数学描述，它使群体遗传学所研究的群体由随机交配群体、近亲交配群体、自交群体扩展到普通群体。

The panmixia hypothesis--that all European eel migrate to the Sargasso Sea for reproduction and comprise a single, randomly mating population--is widely accepted.

欧洲鳗鲡随机交配的假说—所有的欧洲鳗鲡个体都洄游到Sargasso海进行繁殖，组成一个单一并随机交配的群体—一直被广泛接受。

Assortative mating Sexual reproduction in which the pairing of male and female is not random.

选型交配：有性生殖中配对的雌雄双方不足随机交配的现象。

The lowest Fst value shows that less genetic variations exist among population of F.gracilipes whic is close to panmictic There is almost no genetic differentiation between populations of F.statice . Genetic similarity is 55.3%~ 65.2% between species of F.tataricum and its related species, which is close to the average level among species in seed plants.

这些种的近交繁育系数 F 值-0.54～-0.80，为随机交配的居群，杂合体过多；营养繁殖为主的金荞麦的FST值最高，相对较多的遗传多样性存在于居群间，长柄野荞麦相对较少的遗传多样性存在于居群间，更接近于自由交配。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。