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Related Concept Videos

Gene Flow02:39

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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...
Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
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,...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...

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Related Experiment Video

Updated: Jun 11, 2026

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization
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A likelihood ratio test of speciation with gene flow using genomic sequence data.

Ziheng Yang1

  • 1Galton Laboratory, Department of Biology, University College London, United Kingdom. z.yang@ucl.ac.uk

Genome Biology and Evolution
|July 14, 2010
PubMed
Summary

Genomic data can test speciation models. A new likelihood test examines variable divergence times, distinguishing allopatric from parapatric speciation in humans, chimpanzees, and gorillas.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Speciation Research

Background:

  • Genomic sequence data offers insights into species formation processes.
  • Testing speciation models requires robust statistical frameworks.
  • The distinction between allopatric and parapatric speciation remains a key evolutionary question.

Purpose of the Study:

  • To implement a likelihood ratio test for variable species divergence times across the genome.
  • To differentiate between allopatric speciation without gene flow and parapatric speciation with gene flow.
  • To apply this test to genomic data from humans, chimpanzees, and gorillas.

Main Methods:

  • Development of a likelihood framework accommodating coalescent events in ancestral populations.
  • Implementation of two models: one with constant species divergence time, another with variable divergence time.
  • Computer simulations to assess the test's false positive rate and power.

Main Results:

  • The likelihood ratio test demonstrates an acceptable false positive rate.
  • Achieving sufficient statistical power necessitates analyzing hundreds or thousands of genomic loci.
  • The test was successfully applied to human, chimpanzee, and gorilla genomic data.

Conclusions:

  • Variable species divergence times across the genome can be tested using genomic sequence data.
  • The implemented likelihood ratio test provides a statistical tool to evaluate speciation models.
  • Further analysis with extensive genomic loci is recommended for robust conclusions on speciation patterns.