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Evolution of New Traits in Microbes

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

Evolutionary Processes in Microbes

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...

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.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.

Evolution of Microbial Genome

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.

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 chromosome underwent...

Types of Genetic Transfer Between Organisms

Types of Genetic Transfer Between Organisms

Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.

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Updated: Jun 12, 2026

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

How symbiogenic is evolution?

Francisco Carrapiço¹

¹Universidade de Lisboa, Faculdade de Ciências, Departamento de Biologia Vegetal, Lisbon, Portugal. fcarrapico@fc.ul.pt

Theory in Biosciences = Theorie in Den Biowissenschaften

|June 16, 2010

Summary

This summary is machine-generated.

Symbiogenesis, the integration of organisms, creates new entities with emergent properties driving evolution through adaptation. This proposes a post-neodarwinian framework for understanding life and symbiosis.

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Area of Science:

Evolutionary Biology
Symbiosis Research
Theoretical Biology

Background:

Organismal integration leads to emergent properties and synergies beyond individual components.
Evolution is viewed as adaptation to changing conditions, not linear progress.
Existing evolutionary frameworks may not fully encompass the role of symbiosis.

Purpose of the Study:

To propose symbiogenesis as a key evolutionary mechanism.
To challenge traditional evolutionary concepts with a new perspective.
To integrate recent biological data into an expanded theory of evolution.

Main Methods:

Conceptual analysis of evolutionary theory.
Integration of symbiogenesis as a core evolutionary process.
Development of a post-neodarwinian framework.

Main Results:

Symbiogenesis offers a mechanism for emergent properties and synergistic adaptation.
This approach provides a rupture with past evolutionary ideas.
It expands evolutionary theory to incorporate symbiotic phenomena.

Conclusions:

Symbiogenesis represents a significant evolutionary mechanism.
A Symbiogenic Theory of Evolution could foster a new epistemological approach to symbiosis.
This paradigm shift requires further scientific attention and exploration.