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. 2020 Mar 17;45:163–176. doi: 10.3767/persoonia.2020.45.06

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Fig. 4 — Evolution models of mating type in Calonectria spp.: Homothallic origin hypothesis. a. Primary homothallic ancestor mating type locus undergoes two deletions events (gene loss) and this results in the mating type locus of two heterothallic offspring; b–d. primary homothallic ancestor mating type locus undergoes an independent deletion event which results in the present homothallic mating type locus.