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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Gene Evolution - Fast or Slow?02:05

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?02:05

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...
Evolution of New Traits in Microbes01:24

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...
The Evidence for Evolution02:55

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.
Testing a Claim about Mean: Unknown Population SD01:21

Testing a Claim about Mean: Unknown Population SD

A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used; instead...

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Characterization of Metabolic Status in Nonhuman Primates with the Intravenous Glucose Tolerance Test
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Published on: November 13, 2016

Evolutionary rate variation in Old World monkeys.

Navin Elango1, Jeeyoung Lee, Zuogang Peng

  • 1School of Biology, Georgia Institute of Technology, 310 Ferst Drive, Atlanta, GA 30332, USA.

Biology Letters
|March 28, 2009
PubMed
Summary
This summary is machine-generated.

Genomic analysis of Old World monkeys reveals evolutionary patterns similar to hominoids. Primate genomes show lineage-specific rate variations, offering insights into molecular evolution mechanisms.

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Last Updated: Jun 24, 2026

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Area of Science:

  • Comparative genomics
  • Primate evolution
  • Molecular evolution

Background:

  • Understanding primate genome evolution is crucial for deciphering evolutionary relationships and mechanisms.
  • Previous studies have highlighted variations in evolutionary rates across primate lineages.

Purpose of the Study:

  • To analyze genomic divergences and evolutionary rates in Old World monkeys and humans.
  • To investigate the 'male-driven evolution' hypothesis and mutation patterns in primate X-chromosomes.
  • To elucidate the molecular mechanisms underlying substitution rate variation in primate genomes.

Main Methods:

  • Analysis of over 8 million base pairs of bacterial artificial chromosome-based sequence alignments.
  • Comparative genomic analysis of four Old World monkey species and the human genome.
  • Examination of X-chromosome evolution and autosome divergence.

Main Results:

  • Genomic divergences in Old World monkeys parallel those in hominoids.
  • The X-chromosome evolves slower than autosomes, with a lower male mutation bias in Old World monkeys compared to hominoids.
  • Significant lineage-specific evolutionary rate variation was observed, with the baboon lineage showing particularly slow molecular evolution.
  • Mutations from DNA methylation showed minimal variation across lineages, contrasting with overall patterns.

Conclusions:

  • Old World monkeys serve as a valuable model system for studying genome evolution.
  • Lineage-specific evolutionary rate variation is a common feature of primate genome evolution.
  • Further investigation into molecular mechanisms of substitution rate variation is warranted.