Selection for asymmetric signalling between gametes explains the very origins of sexual asymmetry as seen in mating-types with morphologically similar but self-incompatible gametes.

Mating phenotypes are diverse in Schizosaccharomyces pombe and the natural variation can impact the spread of wtf meiotic drivers.

A novel form of self-fertility evolved in Cryptococcus depauperatus, a close relative to the human pathogenic Cryptococcus species, in which sexual development is attained by self-signaling of a cognate pheromone and pheromone-receptor pair.