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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.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...

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.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...

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.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...

Speciation Rates

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.

Understanding Species and Reproductive Barriers

Understanding Species and Reproductive Barriers

A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...

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: Jul 14, 2026

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis

Published on: August 12, 2019

Genetic divergence and hybrid speciation.

Mark A Chapman¹, John M Burke

¹University of Georgia, Department of Plant Biology, Miller Plant Sciences Building, Athens, Georgia 30602, USA. mchapman@plantbio.uga.edu

Evolution; International Journal of Organic Evolution

|June 30, 2007

Summary

Hybrid speciation, the formation of new species through hybridization, can result in diploid or polyploid lineages. Greater genetic divergence between parent species increases the likelihood of polyploid hybrid speciation.

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Area of Science:

Evolutionary biology
Genetics
Speciation

Background:

Natural hybridization is a significant evolutionary force, leading to new species in plants and animals.
Hybrid speciation can result in homoploid (same chromosome number) or polyploid (increased chromosome number) lineages.
Factors influencing ploidy level in hybrid speciation remain largely unknown.

Purpose of the Study:

To investigate the relationship between genetic divergence of parent species and the outcome of hybrid speciation (homoploid vs. polyploid).
To provide direct evidence for factors influencing ploidy level determination in newly formed hybrid species.

Main Methods:

Comparative analysis of genetic divergence between species pairs known to form homoploid hybrid species.
Comparative analysis of genetic divergence between species pairs known to form polyploid hybrid species.
Statistical controls for potential confounding factors in divergence estimates.

Main Results:

Genetic divergence was significantly greater in parent species that formed polyploid hybrid species compared to those forming homoploid hybrid species.
This finding held true even after controlling for confounding variables.

Conclusions:

The degree of genomic divergence between hybridizing species is a key factor influencing whether hybrid speciation results in a diploid or polyploid lineage.
This study provides the first direct evidence supporting the link between interspecific divergence and the mode of hybrid speciation.