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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...
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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
Cis-regulatory Sequences02:02

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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...

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Related Experiment Video

Updated: Jun 1, 2026

Manipulation of Gene Function in Mexican Cavefish
07:01

Manipulation of Gene Function in Mexican Cavefish

Published on: April 22, 2019

Cichlid genomics and phenotypic diversity in a comparative context.

C Darrin Hulsey1

  • 1*Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, 37996, USA.

Integrative and Comparative Biology
|June 14, 2011
PubMed
Summary

Cichlid fish genomics reveal rapid adaptive radiation, offering insights into vertebrate evolution. Their unique traits and extensive evolutionary replication aid in understanding genotype-to-phenotype mapping.

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Ichthyology

Background:

  • Cichlid fishes represent a significant portion of vertebrate species.
  • They exhibit unique jaw structures, diverse breeding systems, and extensive phenotypic convergence.
  • Rapid divergence in traits like jaws, teeth, color patterns, and reproductive biology is unparalleled in vertebrates.

Purpose of the Study:

  • To explore how cichlid genomics and adaptive radiation facilitate studies of evolutionary adaptation.
  • To provide an overview of key findings from cichlid genetic studies regarding vertebrate adaptation.
  • To discuss the utility of cichlid adaptive radiations for genotype-to-phenotype mapping.

Main Methods:

  • Comparative genomics analysis
  • Review of existing genetic studies on cichlids
  • Analysis of phenotypic traits and evolutionary patterns

Main Results:

  • Cichlid adaptive radiations offer tractable models for understanding the genomic basis of divergence.
  • Cichlid genetic studies have yielded significant insights into vertebrate adaptation.
  • Evolutionary replication in cichlids is extensive, facilitating genotype-to-phenotype studies.

Conclusions:

  • Cichlids are a powerful model system for integrating genomics and adaptive radiation research.
  • Their rapid divergence and evolutionary replication provide unique opportunities for evolutionary studies.
  • Further research on cichlids can significantly advance our understanding of genotype-to-phenotype relationships and vertebrate adaptation.