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Related Concept Videos

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...
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...
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.In the early 20th century,...
Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing, inherently...
Complementation Tests00:49

Complementation Tests

A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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,...

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Related Experiment Video

Updated: Jun 25, 2026

Measuring Microbial Mutation Rates with the Fluctuation Assay
07:44

Measuring Microbial Mutation Rates with the Fluctuation Assay

Published on: November 28, 2019

Condition-dependent mutation rates and sexual selection.

S Cotton1

  • 1Research Department of Genetics, Evolution & Environment, University College London, London, UK. s.cotton@ucl.ac.uk

Journal of Evolutionary Biology
|February 13, 2009
PubMed
Summary
This summary is machine-generated.

Females can assess a mate's mutation rate through his ornamentation. Choosing well-ornamented males, whose ornaments signal good condition, helps females avoid deleterious mutations for their offspring.

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Behavioral Ecology

Background:

  • Sexual selection theory posits that male ornaments signal genetic quality, providing indirect benefits to offspring.
  • Recurrent deleterious mutations are a key source of genetic quality variation.
  • Previous models assumed constant mutation rates, overlooking their potential variability.

Purpose of the Study:

  • To propose that mutation rates are condition-dependent and influence sexual selection.
  • To explore how condition-dependent mutation rates can be signaled by male ornamentation.
  • To investigate the implications for female mate choice and offspring genetic quality.

Main Methods:

  • Theoretical modeling of sexual selection under condition-dependent mutation rates.
  • Integration of empirical data showing condition-dependent mutation rates.
  • Analysis of the evolutionary consequences of condition-dependent sexual signals.

Main Results:

  • Male ornaments may signal lower mutation rates if ornamentation and mutation rates are both condition-dependent.
  • Females choosing well-ornamented mates may reduce the germline mutation load passed to offspring.
  • This mechanism offers a novel pathway for 'good genes' sexual selection.

Conclusions:

  • Mutation rates can vary with individual condition, impacting sexual selection dynamics.
  • Condition-dependent ornamentation can serve as a reliable signal of an individual's mutation rate.
  • Understanding condition-dependent mutation is crucial for explaining the evolution of sexual ornaments and mate choice.