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Related Concept Videos

Inheritance01:25

Inheritance

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Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
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Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
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Mutation, Gene Flow, and Genetic Drift01:09

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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Author Spotlight: RNAi Inheritance and ChIP in C. elegans
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Transgenerational epigenetic inheritance increases trait variation but is not adaptive.

René S Shahmohamadloo1, John M Fryxell2,3, Seth M Rudman1

  • 1School of Biological Sciences, Washington State University, Vancouver, WA, United States.

Evolution; International Journal of Organic Evolution
|March 11, 2025
PubMed
Summary
This summary is machine-generated.

Transgenerational epigenetic inheritance (TEI) in Daphnia exposed to Microcystis caused reduced survival and growth, but did not consistently affect offspring production. This epigenetic inheritance led to trait shifts, not adaptive plasticity.

Keywords:
Daphniaepigeneticsgenetic variationglobal changematernal effectphenotypic plasticity

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Genetics

Background:

  • Organismal responses to environmental change are crucial for biodiversity conservation.
  • Epigenetic modifications, including those inherited across generations, are increasingly recognized for their role in environmental stress responses.
  • The extent and fitness impact of epigenetic marks beyond maternal inheritance remain largely unexplored.

Purpose of the Study:

  • To investigate how transgenerational epigenetic inheritance (TEI) influences the phenotypic response of Daphnia clones to the environmental stressor Microcystis.
  • To quantify the fitness consequences of TEI in offspring across generations.

Main Methods:

  • Eight Daphnia genotypes were subjected to Microcystis exposure or control treatments (P0 generation).
  • The fitness (survival, growth, reproduction) of descendants was tracked up to the F3 generation.
  • Phenotypic trait variance was analyzed in relation to TEI.

Main Results:

  • Transgenerational epigenetic exposure to Microcystis resulted in decreased survival and growth rates in offspring.
  • No consistent effects of TEI were observed on offspring production.
  • TEI was linked to increased trait variance, suggesting a potential for heritable bet-hedging strategies.

Conclusions:

  • TEI can induce significant phenotypic shifts in response to environmental stressors like Microcystis.
  • These shifts, however, were not consistently adaptive, indicating transgenerational adaptive plasticity may be infrequent.
  • TEI influences organismal responses to environmental change, but its adaptive significance requires further investigation.