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Related Concept Videos

Types of Selection01:46

Types of Selection

43.9K
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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Speciation Rates01:07

Speciation Rates

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Overview
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Limits to Natural Selection01:38

Limits to Natural Selection

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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.
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Mate Choice01:20

Mate Choice

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Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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What is Natural Selection?01:32

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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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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Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments
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Structural Rearrangements and Selection Promote Phenotypic Evolution in Anolis Lizards.

Raúl Araya-Donoso1, Sarah M Baty1, Jaime E Johnson1

  • 1School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA.

Genome Biology and Evolution
|October 27, 2025
PubMed
Summary

Genomic variations in Anolis lizards, including structural rearrangements and repeat element accumulation, offer insights into their adaptive radiation and the evolution of distinct phenotypes. These genomic changes may drive evolutionary potential and species diversity.

Keywords:
adaptive radiationcomparative genomicsreference genometransposable elements

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Comparative Genomics

Background:

  • Adaptive radiation in Anolis lizards has led to high species diversity and ecological disparity.
  • Genomic characteristics are hypothesized to contribute to evolutionary potential and speciation.

Purpose of the Study:

  • To explore genomic variation in Anolis lizards with distinct phenotypes.
  • To investigate the role of genomic features in Anolis adaptive radiation.

Main Methods:

  • Assembly and annotation of chromosome-level reference genomes for Anolis auratus and Anolis frenatus.
  • Comparative genomic analysis with Anolis carolinensis and Anolis sagrei.
  • Evaluation of structural rearrangements, repeat element density, and positive selection signatures.

Main Results:

  • Detected substantial structural rearrangements in Anolis frenatus scaffolds 1, 2, and 3, with breakpoints near developmental genes.
  • Observed an accumulation of repeat elements around key developmental genes in anoles and outgroups.
  • Identified variations in coding and regulatory regions of developmental and physiological genes linked to distinct phenotypes.

Conclusions:

  • Hierarchical genomic variation within anoles provides a substrate for phenotypic disparity.
  • Genomic changes contribute to the adaptive radiation and diversification of Anolis lizards.