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Related Concept Videos

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,...
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,...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
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.

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Related Experiment Video

Updated: Jun 3, 2026

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

Quantitative genetics and evolution: Is our understanding of genetics sufficient to explain evolution?

R G Beilharz1, B G Luxford, J L Wilkinson

  • 1Agriculture and Forestry, The University of Melbourne, Parkville, Vic., 3052, Australia.

Journal of Animal Breeding and Genetics = Zeitschrift Fur Tierzuchtung Und Zuchtungsbiologie
|March 15, 2011
PubMed
Summary

This study bridges genetics and biology by showing how environmental resources limit fitness and trait evolution. It reconciles modern evolutionary synthesis with theories of punctuated equilibrium and neutral evolution.

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Last Updated: Jun 3, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Why Quantification Matters: Characterization of Phenotypes at the Drosophila Larval Neuromuscular Junction
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Why Quantification Matters: Characterization of Phenotypes at the Drosophila Larval Neuromuscular Junction

Published on: May 12, 2016

Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics
  • Ecology

Background:

  • Geneticists focus on genes and frequencies, while other biologists emphasize environmental constraints on life.
  • Understanding the interplay between genetic factors and environmental limitations is crucial for a comprehensive view of evolution.

Purpose of the Study:

  • To establish a conceptual bridge between genetic and ecological perspectives on evolution.
  • To demonstrate the compatibility of various evolutionary theories with the modern synthetic theory.
  • To explain the mechanisms driving evolutionary change, including adaptation, stasis, and neutral drift.

Main Methods:

  • Conceptual integration of genetic principles with ecological resource limitation.
  • Analysis of how fitness, as a product of component traits, is constrained by environmental resources.
  • Examination of the conditions under which allele frequencies change versus genetic drift occurs.

Main Results:

  • Fitness is limited by the efficient use of environmental resources, leading to optimal trait values.
  • Neutral traits, unimportant to fitness, are subject to genetic drift and substitution at mutation rates.
  • Evolutionary bursts and stasis are explained by strong natural selection on fitness in stable or changing ecosystems.

Conclusions:

  • The proposed framework reconciles genetic and ecological viewpoints, supporting the modern synthetic theory of evolution.
  • Environmental resource availability fundamentally shapes adaptive evolution and constrains trait variation.
  • Neutral evolution accounts for genetic changes in non-adaptive molecular sequences.