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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.

Speciation Rates

Speciation Rates

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 Evidence for Evolution

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

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.

Overview of Transposition and Recombination

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...

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Related Experiment Video

Updated: Aug 23, 2025

Development of Targeting Induced Local Lesions IN Genomes TILLING Populations in Small Grain Crops by Ethyl Methanesulfonate Mutagenesis

Development of Targeting Induced Local Lesions IN Genomes TILLING Populations in Small Grain Crops by Ethyl Methanesulfonate Mutagenesis

Published on: July 16, 2019

Wheat speciation and adaptation: perspectives from reticulate evolution.

Xuebo Zhao^1,2, Xiangdong Fu^1,2, Changbin Yin¹

¹State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, China.

|October 31, 2022

Summary

This summary is machine-generated.

Reticulate evolution shaped bread wheat (Triticum aestivum) through genetic exchange with relatives. Understanding this complex evolutionary history aids future crop improvement and breeding strategies.

Keywords:

Adaptation Evolution Hybridization Introgression Speciation Wheat

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Area of Science:

Plant Science
Evolutionary Biology
Genetics

Background:

Bread wheat (Triticum aestivum) is a globally significant crop.
Reticulate evolution, involving genetic exchange, impacts species fitness and adaptation.
Bread wheat's evolution is characterized by allopolyploid speciation, hybridization, introgression, and horizontal gene transfer (HGT).

Purpose of the Study:

To review the evolutionary history of bread wheat and its wild relatives.
To highlight interspecific hybridization events and reticulate relationships within Triticum and Aegilops genera.
To discuss genetic mechanisms and evolutionary significance of introgression in bread wheat.

Main Methods:

Literature review of evolutionary history.
Analysis of interspecific hybridization events.
Discussion of genetic introgression mechanisms.

Main Results:

Demonstrated reticulate evolutionary relationships between Triticum and Aegilops species/subspecies.
Detailed the impact of hybridization and introgression on bread wheat's evolutionary trajectory.
Highlighted the role of genetic exchange in shaping phenotypic traits and adaptability.

Conclusions:

Understanding the reticulate evolution of Triticum species is crucial.
This knowledge will benefit future genetic studies and breeding of bread wheat.
Reticulate evolution significantly influences bread wheat's adaptability and traits.