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Related Experiment Videos

Evolution and environmental change

J H Edwards1

  • 1Department of Biochemistry, University of Oxford, UK.

Ciba Foundation Symposium
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

Agriculture has reduced disease resistance in livestock through selective breeding, while global trade accelerates epidemic spread. Human genetics show a lack of selection, with subtle, cumulative long-term effects from environmental mutagens.

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Area of Science:

  • Genetics and Evolutionary Biology
  • Epidemiology
  • Agricultural Science

Background:

  • Selective breeding in agriculture has enhanced desirable traits in livestock but decreased their ability to resist diseases.
  • Increased global trade in products and livestock has facilitated the rapid dissemination of epidemics.
  • Human genetics exhibit a lack of directed selection, suggesting passive adaptation to environmental changes.

Purpose of the Study:

  • To analyze the implications of agricultural practices and trade on disease resistance and genetic selection.
  • To examine the long-term effects of minimal human genetic selection.
  • To assess the risks associated with mutagens, particularly radioactivity.

Main Methods:

  • Review of existing literature on agricultural selective breeding and its impact on livestock.

Related Experiment Videos

  • Analysis of epidemiological data concerning the spread of diseases through trade.
  • Examination of human genetic studies to infer trends in selection pressures.

    • Main Results:

    • Selective breeding has led to a trade-off between desirable traits and disease resistance in livestock.
    • Globalized trade networks are significant vectors for rapid epidemic propagation.
    • Human populations show evidence of relaxed selection, with potential for cumulative, albeit poorly understood, long-term genetic effects.

    Conclusions:

    • The study highlights the complex interplay between human interventions (agriculture, trade) and biological evolution.
    • While human genetic changes are subtle and slow, minimizing exposure to mutagens like radioactivity is prudent.
    • Further research is needed to fully comprehend the long-term consequences of relaxed selection and environmental factors on human genetics.