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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.

Evolutionary Relationships through Genome Comparisons

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...

Gene Evolution - Fast or Slow?

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...

Gene Evolution - Fast or Slow?

Gene Evolution - Fast or Slow?

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

Phylogenetic Trees

Phylogenetic Trees

Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.

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Related Experiment Video

Updated: Mar 1, 2026

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

Published on: July 11, 2025

TESTING MACROEVOLUTIONARY HYPOTHESES WITH CLADISTIC ANALYSIS: EVIDENCE AGAINST RECTANGULAR EVOLUTION.

Cliff A Lemen¹, Patricia W Freeman¹

¹University of Nebraska State Museum, Lincoln, NE, 68588-0514.

Evolution; International Journal of Organic Evolution

|June 1, 2017

Summary

This summary is machine-generated.

Computer simulations show that the punctuated-equilibrium hypothesis makes incorrect predictions about evolutionary data. Analysis of real-world cladograms provides strong evidence against this hypothesis, favoring gradualism.

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Area of Science:

Evolutionary Biology
Phylogenetics
Computational Biology

Background:

Cladistic data sets from small monophyletic groups are crucial for understanding evolutionary patterns.
Macroevolutionary theories, such as gradualism and punctuated equilibrium, offer contrasting explanations for evolutionary change.

Purpose of the Study:

To investigate the properties of cladistic data sets using computer simulations.
To compare the predictions of gradualism and the punctuated-equilibrium hypothesis regarding autapomorphy distribution.

Main Methods:

Computer simulations of macroevolution under two models: gradualism and punctuated equilibrium.
Analysis of autapomorphy distribution in simulated cladistic data sets.
Survey of real cladograms from extant monophyletic groups across diverse taxa.

Main Results:

Punctuated equilibrium predicts zero autapomorphies per species under strict stasis, with a bimodal distribution as characters increase.
Gradualism predicts a unimodal distribution of autapomorphies, with the potential for zero species lacking autapomorphies.
Empirical data from real cladograms do not support the predictions of the punctuated-equilibrium hypothesis.

Conclusions:

The observed distribution of autapomorphies in real phylogenetic data contradicts the predictions of the punctuated-equilibrium hypothesis.
Findings provide strong evidence against the punctuated-equilibrium hypothesis and support alternative models like gradualism.