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Speciation Rates

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Formation of Species

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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.

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Genetics of Speciation

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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.

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What is a Species?

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Related Experiment Video

Updated: Mar 1, 2026

Methods for Staging Pupal Periods and Measurement of Wing Pigmentation of Drosophila guttifera

Methods for Staging Pupal Periods and Measurement of Wing Pigmentation of Drosophila guttifera

Published on: January 24, 2018

PATTERNS OF SPECIATION IN DROSOPHILA.

Jerry A Coyne¹, H Allen Orr¹

¹Department of Ecology and Evolution, The University of Chicago, 1103 East 57th Street, Chicago, IL, 60637.

Evolution; International Journal of Organic Evolution

|June 2, 2017

Summary

This summary is machine-generated.

Speciation progresses gradually, with reproductive isolation evolving over time. Prezygotic isolation may strengthen when species become sympatric, explaining patterns like Haldane

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Area of Science:

Evolutionary Biology
Genetics
Speciation Research

Background:

Understanding the timeline of speciation is crucial for evolutionary biology.
Reproductive isolation mechanisms are key to species divergence.

Purpose of the Study:

To investigate the temporal dynamics of speciation.
To analyze the evolution of reproductive isolation in Drosophila.

Main Methods:

Literature review of 119 Drosophila species pairs.
Analysis of genetic distance, mating discrimination, hybrid fitness, and geographic range.
Cross-sectional study correlating divergence time with isolation metrics.

Main Results:

Reproductive isolation (mating discrimination, hybrid sterility/inviability) increases with divergence time.
Prezygotic isolation evolves faster in sympatric than allopatric species.
Haldane's rule explained by a temporal gap in the evolution of male vs. female hybrid incompatibilities.

Conclusions:

Speciation is a gradual process with evolving reproductive barriers.
Ecological context (sympatry vs. allopatry) influences the rate of prezygotic isolation.
Asymmetric evolution of hybrid incompatibilities explains sex-biased hybrid breakdown.