flowers assortatively by degree of symmetry, nectar production, floral structure, and inflorescences, as well as sexual dimorphisms. Fungi appear to make use of sexual selection, although they also often reproduce asexually. In the Basidiomycetes, the sex ratio is biased towards males, implying sexual selection there. Male–male competition to fertilise occurs in fungi including yeasts. Pheromone signaling is used by female gametes and by conidia, implying male choice in these cases. Female–female competition may also occur, indicated by the much faster evolution of female-biased genes in fungi. References Population genetics sv:Naturligt urval#Sexuellt urval