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R. Soc. B."],"published-print":{"date-parts":[[2024,7]]},"abstract":"<jats:p>The evolution of separate sexes from cosexuality requires at least two mutations: a feminizing allele to cause female development and a masculinizing allele to cause male development. Classically, the double mutant is assumed to be sterile, which leads to two-factor sex determination where male and female sex chromosomes differ at two loci. However, several species appear to have one-factor sex determination where sexual development depends on variation at a single locus. We show that one-factor sex determination evolves when the double mutant develops as a male or a female. The feminizing allele fixes when the double mutant is male, and the masculinizing allele fixes when the double mutant is female. The other locus then gives XY or ZW sex determination based on dominance: for example, a dominant masculinizer becomes a Y chromosome. Although the resulting sex determination system differs, the conditions required for feminizers and masculinizers to spread are the same as in classical models, with the important difference that the two alleles do not need to be linked. Thus, we reveal alternative pathways for the evolution of sex determination and discuss how they can be distinguished using new data on the genetics of sex determination.<\/jats:p>","DOI":"10.1098\/rspb.2024.0693","type":"journal-article","created":{"date-parts":[[2024,7,9]],"date-time":"2024-07-09T23:07:02Z","timestamp":1720566422000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["One-factor sex determination evolves without linkage between feminizing and masculinizing mutations"],"prefix":"10.1098","volume":"291","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7182-9946","authenticated-orcid":true,"given":"Michael F.","family":"Scott","sequence":"first","affiliation":[{"name":"School of Biological Sciences, University of East Anglia, Norwich Research Park , Norwich NR4 7TJ, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1234-935X","authenticated-orcid":true,"given":"Simone","family":"Immler","sequence":"additional","affiliation":[{"name":"School of Biological Sciences, University of East Anglia, Norwich Research Park , Norwich NR4 7TJ, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"175","published-online":{"date-parts":[[2024,7,10]]},"reference":[{"doi-asserted-by":"publisher","key":"e_1_3_8_2_2","DOI":"10.1007\/978-3-319-94139-4_1"},{"doi-asserted-by":"publisher","key":"e_1_3_8_3_2","DOI":"10.1002\/j.1537-2197.1995.tb11504.x"},{"doi-asserted-by":"publisher","key":"e_1_3_8_4_2","DOI":"10.3732\/ajb.1400196"},{"doi-asserted-by":"publisher","key":"e_1_3_8_5_2","DOI":"10.1093\/acprof:oso\/9780199657148.001.0001"},{"doi-asserted-by":"publisher","key":"e_1_3_8_6_2","DOI":"10.1016\/j.tig.2011.05.005"},{"doi-asserted-by":"publisher","key":"e_1_3_8_7_2","DOI":"10.1007\/978-3-662-03908-3_2"},{"doi-asserted-by":"publisher","key":"e_1_3_8_8_2","DOI":"10.1111\/j.1469-185X.1942.tb00431.x"},{"doi-asserted-by":"publisher","key":"e_1_3_8_9_2","DOI":"10.1016\/S0065-2660(08)60163-7"},{"doi-asserted-by":"publisher","key":"e_1_3_8_10_2","DOI":"10.1086\/283342"},{"doi-asserted-by":"publisher","key":"e_1_3_8_11_2","DOI":"10.1371\/journal.pbio.1001899"},{"doi-asserted-by":"publisher","key":"e_1_3_8_12_2","DOI":"10.1038\/hdy.1978.83"},{"doi-asserted-by":"publisher","key":"e_1_3_8_13_2","DOI":"10.1146\/annurev-arplant-042817-040615"},{"doi-asserted-by":"publisher","key":"e_1_3_8_14_2","DOI":"10.1111\/nph.16002"},{"doi-asserted-by":"publisher","key":"e_1_3_8_15_2","DOI":"10.1038\/sj.hdy.6800016"},{"doi-asserted-by":"publisher","key":"e_1_3_8_16_2","DOI":"10.1093\/jxb\/ers322"},{"doi-asserted-by":"publisher","key":"e_1_3_8_17_2","DOI":"10.1038\/s41477-021-00884-3"},{"doi-asserted-by":"publisher","key":"e_1_3_8_18_2","DOI":"10.3390\/genes12030381"},{"doi-asserted-by":"publisher","key":"e_1_3_8_19_2","DOI":"10.1146\/annurev-arplant-042110-103914"},{"doi-asserted-by":"publisher","key":"e_1_3_8_20_2","DOI":"10.3732\/ajb.1600029"},{"doi-asserted-by":"publisher","key":"e_1_3_8_21_2","DOI":"10.3389\/fpls.2020.01162"},{"doi-asserted-by":"publisher","key":"e_1_3_8_22_2","DOI":"10.1098\/rstb.2021.0486"},{"doi-asserted-by":"publisher","key":"e_1_3_8_23_2","DOI":"10.1098\/rstb.2020.0092"},{"doi-asserted-by":"publisher","key":"e_1_3_8_24_2","DOI":"10.1007\/978-3-319-94139-4_3"},{"doi-asserted-by":"publisher","key":"e_1_3_8_25_2","DOI":"10.1038\/263125a0"},{"doi-asserted-by":"publisher","key":"e_1_3_8_26_2","DOI":"10.2307\/2389709"},{"doi-asserted-by":"publisher","key":"e_1_3_8_27_2","DOI":"10.2307\/2409184"},{"doi-asserted-by":"publisher","key":"e_1_3_8_28_2","DOI":"10.1098\/rspb.1996.0123"},{"doi-asserted-by":"publisher","key":"e_1_3_8_29_2","DOI":"10.2307\/2410293"},{"doi-asserted-by":"publisher","key":"e_1_3_8_30_2","DOI":"10.1111\/j.1095-8312.1981.tb00748.x"},{"doi-asserted-by":"publisher","key":"e_1_3_8_31_2","DOI":"10.5962\/bhl.title.110054"},{"doi-asserted-by":"publisher","key":"e_1_3_8_32_2","DOI":"10.1016\/S0022-5193(80)80026-9"},{"doi-asserted-by":"publisher","key":"e_1_3_8_33_2","DOI":"10.1016\/j.cub.2009.01.048"},{"doi-asserted-by":"publisher","key":"e_1_3_8_34_2","DOI":"10.1038\/nrg2664"},{"doi-asserted-by":"publisher","key":"e_1_3_8_35_2","DOI":"10.1007\/BF01508307"},{"key":"e_1_3_8_36_2","volume-title":"Genetics: from genes to Genomes","author":"Goldberg ML","year":"2021","unstructured":"Goldberg ML , Fischer JA , Hood L , Hartwell L . 2021 Genetics: from genes to Genomes, 7th edn. 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