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Related Concept Videos

Genetic Variation01:25

Genetic Variation

256
Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
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Genetics of Speciation02:16

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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What is Population Genetics?01:25

What is Population Genetics?

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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.
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Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Genetic Drift03:33

Genetic Drift

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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Incorporating spatial and genetic competition into breeding pipelines with the R package gencomp.

Saulo F S Chaves1,2, Filipe M Ferreira3, Getulio C Ferreira4

  • 1Department of General Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil.

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|January 17, 2025
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Genetic competition can skew breeding results. The new R package, gencomp, simplifies modeling direct (DGE) and indirect genetic effects (IGE) to improve accuracy in plant and tree breeding selection.

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Area of Science:

  • Quantitative genetics
  • Plant breeding
  • Forestry

Background:

  • Genetic competition can impact genotype ranking and genetic gain accuracy.
  • Separating direct (DGE) and indirect genetic effects (IGE) in breeding models is complex and often overlooked.

Purpose of the Study:

  • Introduce gencomp, an R package to simplify (spatial-) genetic competition modeling.
  • Facilitate the separation of DGE and IGE in breeding programs.
  • Improve decision-making in crop and tree breeding.

Main Methods:

  • Developed the gencomp R package for constructing genetic competition matrices.
  • Implemented variance-component approach for fitting (spatial-) genetic competition models.
  • Included functions for extracting variance components, heritabilities, and genetic values.

Main Results:

  • Demonstrated gencomp's utility with simulated Eucalyptus and real potato datasets.
  • Showcased the influence of genetic competition on variance components, heritabilities, and selection.
  • Highlighted gencomp's capability in assessing clonal mixture merit for tree breeding.

Conclusions:

  • gencomp provides a user-friendly tool for implementing advanced genetic competition models.
  • The package aids in more accurate genetic evaluations by accounting for indirect genetic effects.
  • gencomp can enhance selection accuracy and genetic gain in breeding programs.