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Related Concept Videos

Stratified Sampling Method01:16

Stratified Sampling Method

Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a stratified sample, divide the population into groups called strata and then take a...
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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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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.While some alleles of a given gene might be observed commonly, other variants...
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.In the early 20th century,...
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The goodness–of–fit test can be used to decide whether a population fits a given distribution, but it will not suffice to decide whether two populations follow the same unknown distribution. A different test, called the test for homogeneity, can be used to conclude whether two populations have the same distribution. To calculate the test statistic for a test for homogeneity, follow the same procedure as with the test of independence. The hypotheses for the test for homogeneity can be stated as...
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Related Experiment Video

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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
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Published on: December 7, 2021

Using allele sharing distance for detecting human population stratification.

Xiaoyi Gao1, Eden R Martin

  • 1Division of Statistical Genomics, Washington University School of Medicine, St Louis, MO 63108, USA. ray.x.gao@gmail.com

Human Heredity
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

Allele Sharing Distance (ASD) is theoretically explained for human population stratification using single nucleotide polymorphism (SNP) data. This establishes a foundation for general distance-based subpopulation classification with SNPs.

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Area of Science:

  • Population Genetics
  • Human Genetics
  • Bioinformatics

Background:

  • Allele Sharing Distance (ASD) and related metrics have been historically used for population stratification.
  • The theoretical underpinnings for this practical application of ASD have not been previously detailed.

Purpose of the Study:

  • To provide the theoretical background for using ASD in human population stratification analysis.
  • To establish a framework for a general distance-based method for subpopulation classification using single nucleotide polymorphisms (SNPs).

Main Methods:

  • Theoretical analysis of Allele Sharing Distance (ASD) in the context of population genetics.
  • Application of theoretical framework to single nucleotide polymorphism (SNP) genetic data.
  • Comparison of ASD with other related distance metrics.

Main Results:

  • The theoretical basis for employing ASD in human population stratification using SNP data is established.
  • A general distance-based methodology for classifying human subpopulations with SNPs is proposed.
  • The relationship between ASD and other distance metrics is elucidated using HapMap Phase I SNP data.

Conclusions:

  • The theoretical framework validates the use of ASD for population stratification.
  • The study provides a foundation for advanced distance-based methods in population genetics.
  • Findings contribute to understanding genetic diversity and subpopulation structure.