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Related Concept Videos

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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What is Natural Selection?01:32

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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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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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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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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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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.
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Selection strategies and artificial evolution.

J P Gibson1

  • 1Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, N1G 2W1, Guelph, Ontario, Canada.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 15, 2013
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Summary
This summary is machine-generated.

Artificial selection drives evolution based on trait weights and genetic factors. Selection strategies significantly influence the resulting artificial evolution, impacting breeding outcomes.

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Area of Science:

  • Animal breeding and genetics
  • Quantitative genetics
  • Evolutionary biology

Background:

  • Artificial selection is a key driver of evolutionary change in domesticated species.
  • Selection indexes are commonly used in breeding programs to improve desired traits.
  • The effectiveness of selection indexes depends on genetic parameters and trait weighting.

Purpose of the Study:

  • To investigate how different selection strategies affect artificial evolution.
  • To analyze the impact of trait weighting and genetic variances on selection outcomes.
  • To provide insights into choosing optimal selection strategies under economic uncertainty.

Main Methods:

  • Modeling artificial evolution under different selection strategies (individual vs. progeny testing).
  • Analyzing the influence of trait economic weights on selection response.
  • Evaluating the role of phenotypic and genetic variances and covariances.

Main Results:

  • Selection strategy significantly alters the direction and magnitude of artificial evolution.
  • The choice between individual and progeny testing has marked effects on the resulting genetic changes.
  • Economic weights and genetic parameters critically determine the outcome of artificial selection.

Conclusions:

  • The selection strategy is a crucial factor in shaping artificial evolution, alongside trait weights and genetic parameters.
  • Understanding the interplay between selection strategy and genetic architecture is vital for effective breeding.
  • Alternative selection strategies should be considered when economic weights are uncertain to achieve desired evolutionary trajectories.