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Related Concept Videos

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Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Related Experiment Video

Updated: May 9, 2026

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients
07:34

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Published on: August 22, 2018

Reproductive isolation caused by colour pattern mimicry.

C D Jiggins1, R E Naisbit, R L Coe

  • 1The Galton Laboratory, University College London, 4 Stephenson Way, London NW1 2HE, UK. jigginsc@naos.si.edu

Nature
|May 18, 2001
PubMed
Summary
This summary is machine-generated.

Mimetic coloration in Heliconius butterflies drives assortative mating, preventing hybridization and facilitating speciation. This color shift enhances reproductive isolation, even in allopatric populations, suggesting rapid evolutionary divergence.

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Behavioral ecology

Background:

  • Ecological adaptation can drive speciation by promoting assortative mating.
  • Natural examples of adaptation directly causing assortative mating are scarce.
  • Heliconius butterflies provide a model system for studying speciation.

Purpose of the Study:

  • To investigate the role of mimetic coloration in the speciation of Heliconius melpomene and Heliconius cydno.
  • To determine if color pattern mimicry influences mate choice and reproductive isolation.
  • To assess the impact of sympatry on assortative mating preferences.

Main Methods:

  • Experimental manipulation of mate choice in Heliconius butterflies.
  • Observational studies of mating behavior in natural populations.
  • Analysis of hybrid offspring and their adaptive potential.

Main Results:

  • Color pattern mimicry was found to be crucial in the divergence of Heliconius melpomene and Heliconius cydno.
  • Mimetic coloration significantly influences mate choice, leading to assortative mating.
  • Hybrids between the species are rare, non-mimetic, and poorly adapted.
  • Assortative mating is enhanced in sympatric populations, suggesting reinforcement.

Conclusions:

  • A shift in mimetic coloration has directly caused both pre-mating and post-mating isolation between Heliconius sister species.
  • Color-based assortative mating is a key mechanism facilitating rapid speciation in Heliconius butterflies.
  • The findings provide a strong natural example of adaptation driving reproductive isolation and speciation.