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Related Concept Videos

Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Mutations in Microorganisms01:18

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
Genetic Drift03:33

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Sexual selection does not influence minisatellite mutation rate.

William Amos1

  • 1Department of Zoology, Cambridge University, Cambridge, UK. w.amos@zoo.cam.ac.uk

BMC Evolutionary Biology
|January 10, 2009
PubMed
Summary
This summary is machine-generated.

A study found no clear link between minisatellite mutation rates and extra-pair copulations in birds. The original trend was likely due to data errors and selective data choices, highlighting the need for transparent meta-analyses.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Ornithology

Background:

  • A previous study suggested a link between minisatellite mutation rate and extra-pair copulations (EPCs) in birds.
  • This was interpreted as sexual selection driving higher mutation rates in species with strong selection.
  • Concerns were raised about the methodology used to calculate mutation rates.

Purpose of the Study:

  • To re-evaluate the relationship between minisatellite mutation rate and EPC frequency in birds.
  • To verify the findings of Moller and Cuervo using their data and an independent dataset.
  • To assess the reliability of minisatellite mutation rates as a measure of evolutionary rate.

Main Methods:

  • Re-analysis of Moller and Cuervo's original data.
  • Inclusion of data from previously uncited studies.
  • Comparison of mutation rate estimates across species and laboratories.

Main Results:

  • Moller and Cuervo's dataset contained errors that appeared to strengthen their findings.
  • Independent data did not replicate the reported trend; omitting Vireo olivaceus was significant.
  • Mutation rate estimates varied by laboratory/operator, not by species.

Conclusions:

  • No clear relationship exists between minisatellite mutation rate and EPC rate in birds.
  • The original trend is attributable to data errors and selection bias.
  • Methodological transparency is crucial for reliable meta-analyses.