“…Indeed, in many fungi, two gametes can form a new individual only if they carry different mating types, but there is no sexual antagonism or other form of antagonistic selection between cells of opposite mating types; the cells of different mating types do not show contrasted phenotypes or footprints of diversifying selection (Bazzicalupo et al, 2019). Yet, evolutionary strata have been documented on the mating-type chromosomes of multiple fungi, with recombination suppression extending stepwise beyond mating-type determining genes (Fraser et al, 2004, Menkis et al, 2008, Branco et al, 2017, Branco et al, 2018, Hartmann, Duhamel, et al, 2021, Hartmann, Ament-Velásquez, et al, 2021, Vittorelli et al, 2022). Evolutionary strata have also been reported around other supergenes, i.e ., large genomic regions encompassing multiple genes linked by recombination suppression, such as in ants and butterflies (Yan et al, 2020, Jay et al, 2021).…”