Mating types are molecular mechanisms that regulate compatibility in sexually reproducing eukaryotes. They occur in isogamous and anisogamous species. Depending on the group, different mating types are often referred to by numbers, letters, or simply `+` and `-` instead of `male` and `female`, that refer to `sexes` or differences in size...
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http://en.wikipedia.org/wiki/Mating_type
A group within a species classified on the basis of its mating behaviour. Fungi often have genes that control mating type at 1, 2 or even 3 loci and there may be multiple alleles at each locus. In heterothallic species, individuals must differ in mating type alleles at each locus for mating to occur.
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http://www.encyclo.co.uk/visitor-contributions.php
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