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Related Concept Videos

Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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,...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Statistical mechanics and the evolution of polygenic quantitative traits.

N H Barton1, H P de Vladar

  • 1Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, United Kingdom. nick.barton@ist-austria.ac.at

Genetics
|December 18, 2008
PubMed
Summary

This study refines statistical mechanics analogies to precisely model quantitative trait evolution. The new approach accurately predicts allele frequency changes and trait dynamics under various evolutionary forces.

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Statistical mechanics

Background:

  • Quantitative trait evolution is complex, depending on unmeasurable allele frequencies.
  • Previous approximations used statistical mechanics analogies but lacked precision.
  • A generalized method is needed to link allele frequencies to observable trait dynamics.

Purpose of the Study:

  • To develop a more precise approximation for quantitative trait evolution using statistical mechanics.
  • To explicitly link macroscopic trait quantities to evolutionary forces.
  • To provide a general framework for describing allele frequency evolution.

Main Methods:

  • Modified statistical mechanics analogy to model allele frequency dynamics.
  • Calculated macroscopic trait dependencies independent of microscopic details.
  • Used entropy maximization principles for stationary distributions and dynamical changes.

Main Results:

  • Demonstrated that allele frequency distributions under drift, selection, and mutation maximize entropy under observable constraints.
  • Developed approximations for dynamical changes in trait expectations.
  • Achieved accurate predictions for trait mean and genetic variance under directional selection with high mutation rates (4Nμ > 1).

Conclusions:

  • The refined entropy-maximization approach provides a robust framework for quantitative trait evolution.
  • The method accurately approximates trait evolution across different mutation rates and selection types.
  • This framework can describe complex genetic interactions like epistasis.