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Related Concept Videos

Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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.
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.
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.
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).
Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...

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Related Experiment Video

Updated: May 16, 2026

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

Evolutionary genetics: no coming back from neverland.

Artyom Kopp1

  • 1Department of Ecology and Evolution, Center for Population Biology, University of California Davis, One Shields Ave, Davis, CA 95616, USA. akopp@ucdavis.edu

Current Biology : CB
|December 11, 2012
PubMed
Summary

Insect evolution involves host-plant specialization, driven by molecular changes. A cactus-feeding fly

Area of Science:

  • Evolutionary biology
  • Insect ecology
  • Molecular biology

Background:

  • Host-plant specialization is crucial for insect evolution.
  • The molecular mechanisms underlying this specialization are largely unknown.

Purpose of the Study:

  • To investigate the molecular basis of host-plant specialization in a cactus-feeding fly.
  • To identify genetic changes contributing to dietary restriction.

Main Methods:

  • Comparative genomics
  • Enzyme activity assays
  • Sterol metabolism analysis

Main Results:

  • A specific enzyme involved in sterol conversion shows altered activity in the cactus-feeding fly.
  • This enzyme modification restricts the fly's ability to utilize a broader range of sterols.

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Resurrection of Dormant Daphnia magna: Protocol and Applications
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Resurrection of Dormant Daphnia magna: Protocol and Applications

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Related Experiment Videos

Last Updated: May 16, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

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Resurrection of Dormant Daphnia magna: Protocol and Applications

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Conclusions:

  • Changes in sterol-converting enzymes are a key molecular driver of host-plant specialization.
  • This provides insight into the evolution of dietary restrictions in insects.