
[遗][农学] 近交系数;近亲系数
F test showed no significant difference in inbreeding coefficient among the 8 breeds (P \u003e0.05).
F检验表明, 品种间近交系数的差异不显著(P\u003e0.05)。
The contents of ureotelism and globulin increased and hemoglobin decreased with inbreeding coefficient in systematic breeding.
尿素氮和球蛋白含量在系统选择中随近交系数的上升而下降,血红素含量却上升。
Results showed that: the inbreeding coefficient of Guizhou miniature pig was the highest (0.1992), and that of Hanzhong black pig the lowest (0.0727) among random mating populations.
结果表明: 在随机交配群体中, 贵州小型香猪的近交系数最高为0.1992, 汉中黑猪的近交系数最低为0.0727。
We simulated the impacts of breeding herd size, reproductive skew and numbers of breeding stags on the inbreeding coefficient of Père David's deer.
模拟分析了繁殖群体大小、繁殖偏倚和占群优势雄性数目对麋鹿的有效种群大小的影响。
See coefficient of inbreeding.
参见近交系数。
My goal right now is to produce dogs with their COI (Coefficient of Inbreeding) average at about 10%.
我的目标立刻将在大约 10%用他们的COI(同系繁殖的系数)平均生产狗。
The paternal line was developed from inbreeding, its inbreeding coefficient was 38-39%, While the maternal line was selected from generation among closed flock.
父系以近交法建系,近交系数达38—39%,母系以家系闭锁世代选择法建系。
It was concluded that the stemma equimultiple random select cross method could constrain the increments of inbreeding coefficient.
采用家系等量随机选配法保存鸡种,可有效地控制保种群近交系数的增长。
近交系数(Inbreeding Coefficient) 是群体遗传学中的一个核心概念,用于量化个体基因组中两个同源等位基因来源于同一祖先(即血缘相同)的概率。它反映了个体近交的程度,数值范围在0到1之间。该系数由遗传学家休厄尔·赖特(Sewall Wright)提出,通常用符号F 表示。
近交系数(F)的数学定义为:个体携带的两个同源等位基因在某个基因座上血缘相同(identical by descent, IBD) 的概率。血缘相同指这两个等位基因来源于同一个祖先等位基因的拷贝,而非仅仅状态相同。其计算公式可表示为:
$$ F = frac{1}{2} times (1 + F_A) $$
其中 ( F_A ) 是共同祖先的近交系数(若无近交则为0)。例如,表兄妹结婚所生子女的近交系数计算如下:
近交系数直接关联纯合度增加和有害等位基因暴露的风险:
作者:Daniel L. Hartl & Andrew G. Clark(Sinauer Associates出版)
章节:第四章 "Inbreeding and Related Topics"
链接:出版社官网
词条:"Inbreeding Coefficient"
术语库:"Inbreeding Coefficient" in Genetics Glossary
近交系数(inbreeding coefficient)是遗传学中用于衡量个体因近亲繁殖导致基因纯合性增加的指标,通常用符号F 表示。以下是详细解释:
近交系数表示一个个体从共同祖先继承相同等位基因的概率。具体来说,它反映了该个体的两个等位基因来源于同一祖先的可能性。例如,表兄妹结婚的后代,其近交系数为 1/16,意味着有 6.25% 的概率携带来自共同祖先的相同基因。
近交系数可通过家系分析或基因型数据计算。例如:
近交系数为负值时,可能表示基因杂合度高于群体平均水平,需结合具体数据解读。
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