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Though it has evolved independently multiple times, its rarity suggests it may be an unstable or transitory evolutionary strategy. In the well-studied Caenorhabditis elegans, attempts to engineer a trioecious strain have reverted to the hermaphrodite\/male system, reinforcing this view. However, these studies did not consider the sex-determination systems of naturally stable trioecious species. The discovery of free-living nematodes of the Auanema genus, which have naturally stable trioecy, provides an opportunity to study these systems. In Auanema, females produce only oocytes, while hermaphrodites produce both oocytes and sperm for self-fertilization. Crosses between males and females primarily produce daughters (XX hermaphrodites and females), while male-hermaphrodite crosses result in sons only. These skewed sex ratios are due to X-chromosome drive during spermatogenesis, where males produce only X-bearing sperm through asymmetric cell division. The stability of trioecy in Auanema is influenced by maternal control over sex determination and environmental cues. These factors offer insights into the genetic and environmental dynamics that maintain trioecy, potentially explaining its evolutionary stability in certain species.<\/jats:p>","DOI":"10.1093\/genetics\/iyae173","type":"journal-article","created":{"date-parts":[[2024,11,16]],"date-time":"2024-11-16T10:54:43Z","timestamp":1731754483000},"source":"Crossref","is-referenced-by-count":1,"title":["Balancing selfing and outcrossing: the genetics and cell biology of nematodes with three sexual morphs"],"prefix":"10.1093","volume":"229","author":[{"given":"Sally","family":"Adams","sequence":"first","affiliation":[{"name":"School of Life Sciences, University of Warwick , Coventry, CV4 7AL ,","place":["UK"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie","family":"Tandonnet","sequence":"additional","affiliation":[{"name":"Department of Genetics, Microbiology and Statistics, Universitat de Barcelona , Diagonal 643, Barcelona 08028 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