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Related Concept Videos

Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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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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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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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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An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
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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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Related Experiment Video

Updated: Feb 27, 2026

Environmentally Induced Heritable Changes in Flax
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The ecological consequences of environmentally induced phenotypic changes.

Jean P Gibert1, Rachel L Allen1, Ron J Hruska1

  • 1School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588, USA.

Ecology Letters
|June 29, 2017
PubMed
Summary

Resource availability and type alter mixotrophic protist cell shape, influencing population dynamics and predator-prey interactions. These trait changes highlight how environmental shifts impact ecological communities.

Keywords:
Body sizeenvironmental changephenotypespredation riskpredator-prey interactionsresources

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Area of Science:

  • Ecology
  • Environmental Science
  • Protistology

Background:

  • Species traits influence population dynamics and persistence.
  • Environmental factors like resource availability and predation risk can modify key traits such as body size.
  • Understanding how environmental changes affect traits is crucial for predicting ecological consequences.

Discussion:

  • Resource quantity and type significantly impact the phenotype of mixotrophic protists, specifically altering cell shape but not size.
  • Changes in cell shape correlate with carrying capacity, thereby affecting population dynamics.
  • These environmentally induced phenotypic changes result in differential susceptibility to predation, with implications for predator-prey dynamics.

Key Insights:

  • Environmental shifts in resource levels can alter species' traits (phenotype).
  • Phenotypic changes, like altered cell shape, directly influence population dynamics (carrying capacity).
  • Trait-mediated effects cascade to alter ecological interactions, such as predator-prey relationships.

Outlook:

  • Further research is needed to understand trait-mediated interactions in response to environmental change.
  • The findings underscore the importance of considering phenotypic plasticity when assessing ecological responses to global change.
  • Investigating how diverse environmental shifts affect trait-mediated interactions is essential for predicting future ecosystem dynamics.