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Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

Speciation Rates

Speciation Rates

Formation of Species

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.

Hybrid Zones

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.

Genetic Drift

Genetic Drift

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.

Gene Flow

Gene Flow

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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Related Experiment Video

Updated: May 26, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Genomic divergence during speciation: causes and consequences.

Patrik Nosil¹, Jeffrey L Feder

¹Department of Ecology and Evolutionary Biology, University of Boulder, Boulder, CO 80309, USA. patrik.nosil@colorado.edu

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences

|December 28, 2011

Summary

This summary is machine-generated.

Speciation research is shifting focus from individual genes to genome-wide divergence patterns. Understanding these genomic patterns is key to explaining life's diversity.

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Area of Science:

Evolutionary Biology
Genomics
Speciation Research

Background:

Speciation, the process creating life’s diversity, has been studied by identifying individual speciation genes.
Genome-wide divergence patterns during speciation have received less attention.
Key questions remain about gene arrangement and its impact on speciation.

Purpose of the Study:

To explore the genomic perspective of speciation.
To integrate empirical and theoretical approaches using recent advances in sequencing and computation.
To review and document patterns of genomic divergence.

Main Methods:

Review of empirical studies in plants and animals.
Inclusion of theoretical work on speciation.
Analysis of genomic divergence patterns.

Main Results:

Studies are beginning to disentangle the roles of natural selection, gene flow, and recombination rates in generating divergence patterns.
The context of genome-wide divergence throughout the speciation process is being considered.
Collective results highlight the need for experimental validation.

Conclusions:

The field needs to move towards an integrative approach combining sequencing, theory, and experimental work.
A shift from descriptive studies to a predictive framework for speciation is necessary.
Understanding genome-wide patterns is crucial for tackling the causes and consequences of speciation.