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Wahlund effect The overall frequency of the alleles of the individual genes does not change in any way when a large population is divided into several smaller populations. However, small populations are endangered not only by the inbreeding effect , but some of its …

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Wahlund-vaikutus - Wahlund effect. Wikipediasta, ilmaisesta tietosanakirjasta. In populaatiogenetiikan, Wahlund vaikutus on vähentää heterotsygoottisuuden (joka on, kun organismi on kaksi eri alleelien kasvupaikalla) on populaation aiheuttama alapopulaation rakenne. Null alleles and Wahlund effects are well known causes of heterozygote deficits in empirical population genetics studies as compared to Hardy-Weinberg genotypic expectations.

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In this regard, the Wahlund effect probably became larger in larger habitat sizes pooled for F-statistics analyses. Therefore, such genetic structure implies that

In population genetics, the Wahlund effect refers to reduction of heterozygosity (that is when an organism has two different alleles at a locus) in a population caused by subpopulation structure.

The Wahlund Effect and F Statistics -- The Interaction of Drift and Gene Flow The distribution of genetic variation within and between demes is primarily due to the balance between gene flow and drift.
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• Sally earned an A on her test. A Wahlund effect typically occurs for organisms for which population subdivision is unknown, if subsamples are collected at larger scales than the actual subdivision unit. In that case, sampling contains a Wahlund effect that affects all statistics all together. In der Populationsgenetik spricht man vom Wahlund-Effekt wenn die Heterozygosität einer Population durch Strukturierung in Unterpopulationen reduziert wird. Insbesondere wenn zwei oder mehr Unterpopulationen unterschiedliche Allelfrequenzen haben, ist die gesamte Heterozygosität reduziert, selbst wenn sich die Unterpopulationen in einem Hardy-Weinberg-Gleichgewicht befinden.

Namely, if two or more subpopulations have different allele frequencies then the overall heterozygosity is reduced, even if the subpopulations themselves are in a Hardy-Weinberg equilibrium . multilocus extensions of Wahlund’s inequality as con-sequences of Ho¨lder’s inequality. We then discuss implications for identity coefﬁcients and genotypic associations in Section 4, providing examples of the two-locus Wahlund inequality using genotypes from humanpopulations. 1.
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2017-11-20

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