11. :You are asking about evolution of mating types . 12. Only opposite mating types , or genetically compatible organisms, can unite in conjugation. 13. Izogamic fertilization includes two gametes fusion, when different mating types form a zygote. 14. Additionally of the mating types , the positive strain is more pathogenic then the negative strain. 15. Some fungi take multiple mating types to the extreme, and have many thousands of sexes. 16. Note that separate mating types don't necessarily imply polymorphism ( or sexual dimorphism ). 17. These mutants, they reasoned, were specifically defective in silencing the cryptic mating type genes. 18. "Sporidiobolus salmonicolor " is a heterothallic species; two mating types are known. 19. It was named after yeast mating types switching ( SWI ) and sucrose nonfermenting ( SNF ). 20. If a tree is surrounded by mycelium of different mating types , eventually one type becomes predominant.
