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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: May 5, 2026

Choice and No-Choice Assays for Testing the Resistance of A. thaliana to Chewing Insects
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Choice and No-Choice Assays for Testing the Resistance of A. thaliana to Chewing Insects

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From tough nuts to touch-me-nots.

Jan U Lohmann1, Detlef Weigel

  • 1Department of Molecular Biology, Max Planck Institute for Developmental Biology, D-72076 Tübingen, Germany.

Cell
|March 24, 2004
PubMed
Summary

Spontaneous seed dispersal in fruits relies on specialized cell types. Liljegren and colleagues reveal a complex gene network controlling this intricate plant reproductive mechanism.

Area of Science:

  • Plant biology
  • Developmental biology
  • Genetics

Background:

  • Spontaneous seed dispersal is a key reproductive strategy in many plant species.
  • This mechanism involves the coordinated action of diverse cell types within the fruit.

Discussion:

  • The study identifies a nonlinear network of transcription factor genes.
  • This network governs the precise execution of the seed dispersal process.

Key Insights:

  • A complex genetic regulatory network controls fruit-based seed dispersal.
  • Transcription factors play a crucial role in orchestrating this nonlinear biological mechanism.

Outlook:

  • Further research can explore the evolutionary conservation of this network.

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  • Understanding this mechanism could inform agricultural applications for improved crop yields.