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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.

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.

Eukaryotic Evolution

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...

Synteny and Evolution

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...

Gene Evolution - Fast or Slow?

Gene Evolution - Fast or Slow?

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...

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Related Experiment Video

Updated: Feb 10, 2026

Synthesis of Keratin-based Nanofiber for Biomedical Engineering

Synthesis of Keratin-based Nanofiber for Biomedical Engineering

Published on: February 7, 2016

Evolution of Trichocyte Keratins.

Leopold Eckhart¹, Florian Ehrlich²

¹Research Division of Biology and Pathobiology of the Skin, Department of Dermatology, Medical University of Vienna, Vienna, Austria. leopold.eckhart@meduniwien.ac.at.

Advances in Experimental Medicine and Biology

|May 26, 2018

Summary

Keratin evolution is tied to epithelial development and appendages like hair. Gene duplication and sequence changes created diverse keratins, enabling complex structures like mammalian hair.

Keywords:

Claw Cysteine Epithelium Evolution Gene duplication Hair Molecular phylogenetics Nail Sequence motif Tongue

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Molecular Evolution of the Tre Recombinase

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Published on: May 29, 2008

Area of Science:

Evolutionary biology
Molecular biology
Genomics

Background:

Keratins are intermediate filament proteins crucial for epithelial structure.
Their evolution is intertwined with the development of epithelial appendages, notably hair.

Purpose of the Study:

To outline the evolutionary history of keratins.
To detail key events in keratin evolution, particularly their role in mammalian integument development.

Main Methods:

Comparative genomics studies across various species.
Characterization of keratins in model organisms.

Main Results:

Keratins evolved from a primordial intermediate filament gene through duplication and sequence modification.
Diversification of keratins led to specialized cytoskeletal properties and disulfide bond cross-linking in structures like claws and hair.
Co-option of cysteine-rich keratins was a key event in the evolution of mammalian hair follicles.

Conclusions:

Keratin evolution is a fundamental process underlying the development of epithelial tissues and appendages.
The diversification of keratins was essential for the emergence of complex structures like mammalian hair and the integument.