Structural genomic variation and behavioral interactions underpin a balanced sexual mimicry polymorphism.

How phenotypic diversity originates and persists within populations are classic puzzles in evolutionary biology. While balanced polymorphisms segregate within many species, it remains rare for both the genetic basis and the selective forces to be known, leading to an incomplete understanding of many classes of traits under balancing selection. Here, we uncover the genetic architecture of a balanced sexual mimicry polymorphism and identify behavioral mechanisms that may be involved in its maintenance in the swordtail fish Xiphophorus birchmanni.

Recurrent evolution of small body size and loss of the sword ornament in Northern swordtail fish.

Across the tree of life, species have repeatedly evolved similar phenotypes. While well-studied for ecological traits, there is also evidence for recurrent evolution of sexually selected traits. Swordtail fish (Xiphophorus) is a classic model system for studying sexual selection, and female Xiphophorus exhibit strong mate preferences for large male body sizes and a range of sexually dimorphic ornaments.

Swordtail fish hybrids reveal that genome evolution is surprisingly predictable after initial hybridization.

Over the past 2 decades, biologists have come to appreciate that hybridization, or genetic exchange between distinct lineages, is remarkably common-not just in particular lineages but in taxonomic groups across the tree of life. As a result, the genomes of many modern species harbor regions inherited from related species. This observation has raised fundamental questions about the degree to which the genomic outcomes of hybridization are repeatable and the degree to which natural selection drives such repeatability.

An observational cross-sectional study of pharmaceutical waste disposal practices in Australian medical imaging departments: A comparison of community versus hospital practice.

Introduction: Pharmaceuticals are used widely in radiography practice but pose an environmental risk. This study explored Australian radiographers' environmental attitude, pharmaceutical waste disposal practices, and knowledge and concern regarding the environmental impact of these pharmaceuticals.

Methods: This study utilised an anonymous, online questionnaire developed from two validated questionnaires.

Patient-centered care measures through the eyes of South African Radiographers and patients: A survey approach.

Background: Worldwide there has been a shift in the ideology within healthcare systems that focuses on 'people' rather than the 'patients'. A patient should not only be perceived by their condition but rather viewed holistically as a person. Within a South African (SA) context, the constitution has been amended to state that all South African citizens have the right to healthcare that is caring, free from harm, and effective.