In Agaricomycotina, bipolar organisms mostly have multiple alleles for their " A " mating locus; however, in Ustilaginomycotina and Pucciniomycotina, the " b " mating locus is predominantly diallelic, which reduces the occurrence of outcrossing within these species . or 2 ) both mating loci have become physically linked such that they now act as a single locus; this has occurred in the smut plant pathogen " U . hordei " and in the human pathogen " Cryptococcus neoformans ".
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