Fungi have different ways of reproducing, with some mostly reproducing without sex. Some fungi only outcross rarely, while others mix genes frequently. Fungi have evolved ways to reduce the costs of both sexual and asexual reproduction. Most fungi have the ability to outcross and undergo meiosis, but this doesn't predict how often they actually have sex. Population genetics can help estimate how often fungi have sex, showing that many species switch between sexual and asexual reproduction. Fungi have specific mechanisms to make both types of reproduction less costly.