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A major obstacle is the time and expertise needed to collect virgins accurately for controlled crosses, since miscollected males or nonvirgin females introduce unintended genotypes and distort results. This work adapts a heat-shock–induced conditional lethal approach to eliminate male larvae before adult emergence, ensuring females eclose without males and remain virgin, simplifying execution for larger classes and research settings.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":11,"@type":70,"position":76},"https://docshare.wps.com/template/presentations/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/enhancing-undergraduate-teaching-and-research-with-a-drosophila-virginizing-system/278102/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/enhancing-undergraduate-teaching-and-research-with-a-drosophila-virginizing-system/278102.png","ImageObject",442,249,{"name":88,"@type":89},"Logic","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-21","2026-09-15",true,{"@type":98,"interactionType":99,"userInteractionCount":15},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"Why is accurate virgin collection a challenge in Drosophila-based undergraduate work?","Question",{"text":108,"@type":109},"Collecting virgins requires both time and skill; errors such as using males as females or nonvirgin females contaminate crosses with unintended genotypes and confound expected outcomes.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"How does the proposed virginizing system prevent male offspring from interfering with crosses?",{"text":113,"@type":109},"A heat-shock–induced, conditional lethal transgene specifically eliminates male larvae before adults eclose, so females emerge in the absence of males and remain virgin.",{"name":115,"@type":106,"acceptedAnswer":116},"What benefits does this method provide for instructors and larger laboratory settings?",{"text":117,"@type":109},"The approach is reliable, adaptable to desired phenotypic markers, scalable for large classes, and accessible for instructors without prior Drosophila expertise.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},278102,1791749462,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":8,"category_name":11,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":15,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":135,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":76},1099513958762,"https://ap-avatar.wpscdn.com/avatar/1000023916a998db790?x-image-process=image/resize,m_fixed,w_180,h_180&k=1784791008015729253","CBE—Life Sciences Education Vol. 5, 353–360, Winter 2006  \nArticle  \nEnhancing Undergraduate Teaching and Research with a Drosophila Virginizing System  \nDennis R. Venema  \nFaculty of Natural and Applied Sciences, Department of Biology, Trinity Western University, Langley, British Columbia V2Y 1Y1, Canada  \nSubmitted March 20, 2006; Revised August 10, 2006; Accepted August 17, 2006 Monitoring Editor: Karen Kalumuck  \nLaboratory exercises using Drosophila crosses are an effective pedagogical method to complement traditional lecture and textbook presentations of genetics. Undergraduate thesis research is another common setting for using Drosophila. A significant barrier to using Drosophila for undergraduate teaching or research is the time and skill required to accurately collect virgins for use in controlled crosses. Erroneously collecting males or nonvirgin females contaminates crosses with unintended genotypes and confounds the results. Collecting adequate numbers of virgins requires large amounts of time, even for those skilled in virgin collection. I have adapted an effective method for virgin collection that eliminates these concerns and is straightforward to use in undergraduate settings. Using a heat-shock–induced, conditional lethal transgene specifically in males, male larvae can be eliminated from a culture before adults eclose. Females thus eclose in the absence of males and remain virgin, eliminating the need to laboriously score and segregate freshly eclosed females. This method is reliable, easily adaptable to any desired phenotypic marker, and readily scaleable to provide sufficient virgins for large laboratory classes or undergraduate research projects. In addition, it allows instructors lacking Drosophila expertise to use this organism as a pedagogical tool.  \nINTRODUCTION  \nDrosophila melanogaster is commonly used as an example in introductory biology and genetics courses. For example, a survey of introductory biology texts indicates that Drosophila is commonly used as a historical example validating the chromosomal theory of inheritance: Campbell and Reece (2005) and Raven et al. (2005) use Morgan’s historic experiments with the original white mutant to illustrate this concept and introduce sex linkage. Drosophila is also a common choice for discussing recombination of linked loci: examples include mapping black to vestigial (Campbell and Reece, 2005; Solomon et al., 2005; Campbell et al., 2006), white to yellow (Freeman, 2005), and carnation to Bar (Raven et al., 2005) . Introductory genetics texts also rely heavily on Drosophila for examples of these and many other genetic concepts. For example, Griffiths et al.,(2005), Klug et al. (2006), Russell (2006), and Brooker (2005) unanimously use Mor  \nDOI: 10.1187/cbe.06–03–0152  \nAddress correspondence to: Dennis R. Venema (dennis.venema@ [twu.ca](twu.ca)).  \ngan’s experiments to introduce and illustrate recombination mapping (purple to vestigial, white to miniature, yellow to white, and a three-point testcross of yellow, white, and miniature, respectively) . Additionally, all of these texts use Morgan’s work with white to illustrate sex linkage.  \nI teach Introductory Biology to both majors (Biology 114) and nonmajors (Biology 104) at Trinity Western University (Langley, British Columbia, Canada) . The laboratory portions of these courses are combined (such that a given laboratory section will have a mix of both majors and nonmajors students and cover identical material) . Both courses contain a unit on Mendelian inheritance, for which I have selected several desired learning outcomes, including 1) to understand basic genetics vocabulary and concepts and 2) to understand the mode of inheritance for a visible phenotype. This requires students to understand the difference between dominant or recessive mutations (relative to wild type) and to distinguish when such mutations reside at autosomal or sex-linked loci. To augment my lecture material (which is identical ","cbCaip17a8R4IBgD","https://ap.wps.com/l/cbCaip17a8R4IBgD","pdf",534020,8,"English","# Introduction\n## Virgin collection challenges in Drosophila teaching and research\n## Heat-shock induced conditional lethal virginizing method","[{\"question\":\"Why is accurate virgin collection a challenge in Drosophila-based undergraduate work?\",\"answer\":\"Collecting virgins requires both time and skill; errors such as using males as females or nonvirgin females contaminate crosses with unintended genotypes and confound expected outcomes.\"},{\"question\":\"How does the proposed virginizing system prevent male offspring from interfering with crosses?\",\"answer\":\"A heat-shock–induced, conditional lethal transgene specifically eliminates male larvae before adults eclose, so females emerge in the absence of males and remain virgin.\"},{\"question\":\"What benefits does this method provide for instructors and larger laboratory settings?\",\"answer\":\"The approach is reliable, adaptable to desired phenotypic markers, scalable for large classes, and accessible for instructors without prior Drosophila expertise.\"}]","Enhancing Undergraduate Teaching and Research with a Drosophila Virginizing System | PDF",1789506988]