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