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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Fungal Biol Rev. 2015 Dec 1;29(3-4):220–229. doi: 10.1016/j.fbr.2015.06.001

Fig 2.

Fig 2

Different breeding systems in the fungi. Homothallism means that each haploid is compatible with all other haploids and heterothallism is when only cells of different mating types can mate. Bipolarity qualifies heterothallism where the mating type is determined by a single locus while under tetrapolarity mating can only occur when the two mating-type loci carry different alleles. Letters A and B indicate mating-type loci and numbered subscripts indicate alternate alleles, where they occur.