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Related Concept Videos

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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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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Limits to Natural Selection01:38

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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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Natural Selection and Mating Preferences01:06

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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.
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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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Genetic Drift03:33

Genetic Drift

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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.
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Natural selection and evolution: evolving concepts.

Andre J van Wijnen1, Eric A Lewallen2

  • 1Department of Biochemistry, University of Vermont, Burlington, VT, 05405, USA.

Academia Biology
|June 14, 2024
PubMed
Summary
This summary is machine-generated.

Biological evolution and natural selection definitions are refined by new studies. Current models integrate adaptive and non-adaptive processes, with natural selection proposed as a biological law.

Keywords:
biological lawbiological theoryfitnessgenotypephenotype

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Molecular Biology

Background:

  • Recent studies refine definitions of biological evolution and natural selection.
  • Current models incorporate adaptive and non-adaptive processes.
  • Focus on molecular genetic changes and DNA modification in unicellular and metazoan species.

Purpose of the Study:

  • To expand and refine definitions of biological evolution and natural selection.
  • To present arguments for considering natural selection as a biological law.
  • To highlight the predictive value of the evolutionary framework.

Main Methods:

  • Review and synthesis of recent studies in evolutionary biology.
  • Analysis of current evolutionary models incorporating genetic changes.
  • Examination of DNA modification in unicellular and metazoan cells.

Main Results:

  • Evolutionary models now integrate diverse adaptive and non-adaptive processes.
  • Natural selection can be viewed as a biological law with mathematical descriptions of fitness.
  • Phenotypic variation's role in species adaptation is clarified within the evolutionary framework.

Conclusions:

  • The conceptual framework for biological evolution is cohesive and predictive.
  • Advancements in high-resolution technologies will further evolve our understanding.
  • Both adaptive and non-adaptive changes driving phenotypes are key areas for future research.