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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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What is Population Genetics?01:25

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The accurate values of population parameters such as population proportion, population mean, and population standard deviation (or variance) are usually unknown. These are fixed values that can only be estimated from the data collected from the samples. The estimates of each of these parameters are sample proportion, the sample mean, and sample standard deviation (or variance). To obtain the values of these sample statistics, data are required that have particular distribution and central...
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Related Experiment Video

Updated: Jun 1, 2026

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization
13:55

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization

Published on: February 3, 2013

ldne: a program for estimating effective population size from data on linkage disequilibrium.

Robin S Waples1, Chi DO

  • 1Northwest Fisheries Science Center, 2725 Montlake Blvd. East, Seattle, WA 98112, USA.

Molecular Ecology Resources
|May 19, 2011
PubMed
Summary

A new program, ldne, offers bias-corrected estimates of effective population size (N(e)) using linkage disequilibrium data. It provides flexible analysis for various genetic data and mating systems, improving confidence interval accuracy.

Related Experiment Videos

Last Updated: Jun 1, 2026

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization
13:55

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization

Published on: February 3, 2013

Area of Science:

  • Population Genetics
  • Bioinformatics
  • Computational Biology

Background:

  • Estimating effective population size (N(e)) is crucial for understanding population dynamics.
  • Linkage disequilibrium (LD) data provides a valuable resource for N(e) estimation.
  • Existing methods for N(e) estimation may have limitations in bias correction and confidence interval accuracy.

Purpose of the Study:

  • To introduce ldne, a novel software tool for calculating bias-corrected effective population size (N(e)) estimates.
  • To implement a new bias correction method for N(e) estimation using linkage disequilibrium data.
  • To provide a user-friendly interface for analyzing genotypic data with flexible parameters.

Main Methods:

  • The ldne program utilizes a Visual Basic interface for ease of use.
  • It processes genotypic data in standard formats, accommodating diverse sample sizes, individuals, loci, and alleles.
  • The software supports random and lifetime monogamy mating systems and applies different criteria for rare allele exclusion.

Main Results:

  • ldne implements a recently developed bias correction for N(e) estimation.
  • The program facilitates evaluation of highly polymorphic markers like microsatellites by allowing variable rare allele exclusion.
  • A novel jackknife method for confidence intervals demonstrates superior performance compared to existing parametric methods.

Conclusions:

  • ldne provides a robust and flexible tool for accurate effective population size estimation.
  • The implemented bias correction and jackknife confidence intervals enhance the reliability of genetic diversity assessments.
  • This program aids researchers in analyzing complex population genetic data more effectively.