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Cross-sexual transfer, where traits shift between sexes, is an under-studied evolutionary concept. This study reintroduces it as a key framework for understanding sexual variation and evolution.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Genetics

Background:

  • The concept of cross-sexual transfer, introduced by Mary Jane West-Eberhard, describes trait expression shifts between sexes.
  • This phenomenon is potentially ubiquitous but remains under-studied and under-cited in scientific literature.
  • Existing research often overlooks its significance in explaining sexual variation.

Purpose of the Study:

  • To reintroduce cross-sexual transfer as a vital framework for understanding sexual variation.
  • To highlight its relevance in contemporary studies of sexual heteromorphism evolution.
  • To stimulate further research into the mechanisms and patterns of cross-sexual transfer.

Main Methods:

  • Review and synthesis of existing literature on cross-sexual transfer.
  • Analysis of exemplary studies published in the last two decades.
  • Identification of potential research avenues, including within-sex polymorphic and sex-role reversed species.

Main Results:

  • Cross-sexual transfer is a powerful, yet underutilized, concept for explaining sex differences in traits.
  • Exemplary studies demonstrate its application in understanding sexual heteromorphism.
  • Within-sex polymorphic and sex-role reversed species offer promising avenues for future research.

Conclusions:

  • Cross-sexual transfer provides a valuable lens for studying the evolution of sexual phenotypes.
  • Further research is needed on nonhormonal mechanisms and broad taxonomic patterns.
  • The framework is crucial for understanding the nonbinary and continuous nature of sexual heteromorphism.