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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.

Speciation Rates

Speciation Rates

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.

Mutation, Gene Flow, and Genetic Drift

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).

What is Natural Selection?

What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.

Types of Selection

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

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Related Experiment Video

Updated: Jun 18, 2025

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

Evolution across the adaptive landscape in a hyperdiverse beetle radiation.

Yun Li¹, Craig Moritz², Ian G Brennan³

¹Division of Ecology & Evolution, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia; Australian National Insect Collection, CSIRO, Canberra, ACT 2601, Australia.

Current Biology : CB

|July 27, 2024

Summary

Darkling beetles (Tenebrionidae) show rapid evolution and diversification, driven by ecological opportunity. Their history reveals bursts of change and body shape convergence, especially after the Cretaceous-Palaeogene mass extinction.

Keywords:

Simpsonian Tenebrionidae adaptive evolution beetle phylogenetics ecological opportunity phenotypic convergence phylogenomic conflict rapid radiation

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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

Area of Science:

Evolutionary Biology
Macroevolutionary Dynamics
Ecology

Background:

Beetle diversification is a key example of adaptive evolution, but its drivers and tempo are unclear.
Darkling beetles (Tenebrionidae) represent one of the most ecomorphologically diverse families, with over 30,000 species.
Understanding their macroevolutionary dynamics can illuminate broader patterns of diversification.

Purpose of the Study:

To investigate the macroevolutionary dynamics of darkling beetles (Tenebrionidae).
To resolve deep phylogenetic relationships within the family using genomic data.
To analyze the tempo and drivers of ecomorphological diversification in this hyperdiverse group.

Main Methods:

Utilized multiple genomic datasets to reconstruct the phylogeny of Tenebrionidae.
Incorporated a landmark-based dataset of body shape morphology.
Applied macroevolutionary analyses to assess diversification rates and ecological transitions.

Main Results:

Resolved deep relationships within Tenebrionidae, revealing ancient rapid radiations.
Identified a significant pulse of phenotypic diversification near the Cretaceous-Palaeogene (K/Pg) mass extinction.
Observed body shape convergence linked to recurrent ecological specializations and contrasting diversification patterns in Australasian clades.

Conclusions:

Darkling beetle evolution is characterized by rapid radiations, frequent ecological shifts, and bursts of morphological change.
Ecological opportunity played a significant role in driving their immense ecomorphological diversity.
Findings support the Simpsonian model of adaptive evolution and highlight phylogenetic niche conservatism versus adaptive radiation.