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Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

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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...
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Types of Selection01:46

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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...
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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.
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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Natural Selection and Adaptation01:15

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Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
Beyond physical adaptations,...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Directional selection can drive the evolution of modularity in complex traits.

Diogo Melo1, Gabriel Marroig2

  • 1Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Sao Paulo, SP 05508-090, Brazil diogro@usp.br.

Proceedings of the National Academy of Sciences of the United States of America
|December 31, 2014
PubMed
Summary
This summary is machine-generated.

Directional selection actively restructures genetic variation, promoting trait modularity. Stabilizing selection maintains these patterns, while drift and stabilizing selection alone are inefficient at creating modularity.

Keywords:
G-matrixphenotypic correlationspleiotropyquantitative geneticsvariational modularity

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Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics
  • Systems Biology

Background:

  • Modularity is crucial for understanding biological organization across multiple levels.
  • Key questions concern the origin and maintenance of modularity.
  • Previous studies focused on bivariate systems.

Purpose of the Study:

  • Investigate the emergence and maintenance of modularity in biological systems.
  • Extend modularity research from bivariate to multivariate systems.
  • Analyze the roles of drift, stabilizing selection, and directional selection in shaping trait covariation.

Main Methods:

  • Developed an individual-based quantitative genetics simulation framework.
  • Modeled multivariate systems with numerous traits and loci.
  • Incorporated mutation, recombination, drift, and selection (stabilizing and directional).
  • Simulated pleiotropic relations between traits.

Main Results:

  • Drift and stabilizing selection alone are insufficient for generating modular variational structures.
  • Directional selection significantly alters modular structures by restructuring genetic variation.
  • Combined directional and stabilizing selection can create complex covariation patterns.
  • Stabilizing selection is vital for preserving established covariation patterns.

Conclusions:

  • Directional selection actively shapes trait modularity, potentially facilitating adaptation.
  • Modularity arises and is maintained through complex interactions of evolutionary forces.
  • The study extends previous findings on modularity to more complex multivariate systems.