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When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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在大样本中,身份按血统细分.

Seth D Temple1, Elizabeth A Thompson2

  • 1Department of Statistics, University of Washington, Seattle, WA, USA; Department of Statistics, University of Michigan, Ann Arbor, MI, USA; Michigan Institute for Data and AI in Society, University of Michigan, Ann Arbor, MI, USA.

Theoretical population biology
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概括

认同下降 (IBD) 分段长度在理论上很难建模. 这项研究表明,IBD的发病率通常分布在大量人群中,为遗传分析提供了有用的近似值.

科学领域:

  • 人口遗传学 人口遗传学
  • 统计遗传学 统计遗传学
  • 基因组学就是基因组学.

背景情况:

  • 在扩展区域共享等位基因的哈普洛类型表明最近的共同祖先 (身份由血统,IBD).
  • 由于祖先树和重组过程,建模IBD细分长度是复杂的.
  • 人口遗传学的理论衍生经常受到这些复杂性的挑战.

研究的目的:

  • 为了研究可检测的身份-按-下降段的理论分布.
  • 在各种人口情景下将IBD率的中央极限定理概括.
  • 评估高斯分布作为实际遗传数据中IBD率的近似值的适用性.

主要方法:

  • 可检测IBD段的分布的理论导出.
  • 中央极限定理对灵活的人口模型的概括.
  • 有效的模拟研究IBD率的分布行为.

主要成果:

  • 在一个位点周围可检测的IBD细分的比例通常分布在大样本和缩放的种群大小.
  • 一般化包括灵活的人口统计,多途径IBD和多变量IBD率.
  • 有限样本中的非正常性可能导致过度IBD的全基因组扫描中的反保守性错误率.
关键词:
非对称的正常性 异常的正常性燃烧的光灯.协变性是指共变性.根据血统的身份.

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结论:

  • 在特定条件下,高斯分布作为IBD率的合理近似模型.
  • 了解IBD发病率分布对于准确的遗传分析和避免错误阳性结果至关重要.
  • 在有限样本中偏离正常的偏差对全基因组关联研究具有实际意义.