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Related Concept Videos

Evolutionary Relationships through Genome Comparisons02:54

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...
Synthetic Biology02:55

Synthetic Biology

Synthetic biology is an interdisciplinary science that involves using principles from disciplines such as engineering, molecular biology, cell biology, and systems biology. It involves remodeling existing organisms from nature or constructing completely new synthetic organisms for applications such as protein or enzyme production, bioremediation, value-added macromolecule production, and the addition of desirable traits to crops, to name a few.
Golden rice
Golden rice is a genetically modified...
Evolutionary Processes in Microbes01:26

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...
Synteny and Evolution02:31

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...
Evolution of Microbial Genome01:08

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.
Eukaryotic Evolution01:24

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...

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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

An extended synthesis for evolutionary biology.

Massimo Pigliucci1

  • 1Department of Ecology and Evolution, Stony Brook University, Stony Brook, New York 11794, USA. pigliucci@genotypebyenvironment.org

Annals of the New York Academy of Sciences
|July 2, 2009
PubMed
Summary

Evolutionary biology is expanding with new discoveries and ideas, not facing a crisis. The Extended Synthesis builds upon the Modern Synthesis, incorporating fields like evo-devo and complexity theory.

Area of Science:

  • Evolutionary biology
  • Conceptual history of science

Background:

  • Evolutionary theory is currently experiencing significant discussion and reevaluation.
  • This period of intense debate is often misrepresented as a crisis by pseudoscientists.

Observation:

  • The field is expanding dramatically with new empirical discoveries and innovative ideas.
  • The conceptual history traces from Darwinism to neo-Darwinism and the Modern Synthesis.

Findings:

  • The proposed Extended Synthesis offers a more inclusive conceptual framework.
  • This framework integrates evo-devo, expanded heredity theories, complexity theory, evolvability, and reevaluated levels of selection.

Implications:

  • Evolutionary biology has not experienced a philosophical paradigm shift since its inception as an empirical science.

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  • The Extended Synthesis represents an expansion, not a replacement, of the Modern Synthesis, likely taking decades to fully develop.