Mating can take place only between individuals of opposite mating types due to the interaction of cell surface components.
Mating type
In many species of microorganisms individuals can be divided into two types. Mating can take place only between individuals of opposite mating types due to the interaction of cell surface components.
"Selective acquisition of novel mating type and vegetative incompatibility genes via interspecies gene transfer in the globally invading eukaryote Ophiostoma novo-ulmi.". Mol Ecol. 15: 249-262. PMID 16367844.
exposed some of the conidia of one mating type of Neurospora to ultraviolet rays in order to induce mutations.
These critters have numerous mating types. There can be very complicated compatability of mating types.
Chlamydomonas: The unicellular green alga that is probably the closest living organism to the ancestor of green plants. It reproduces both asexually and sexually (two mating types).
Gametes from two different mating types (since this organism is typically isogamous we cannot use the terms male and female) come into contact and join to form a diploid zygote.
zygospore In fungi, a structure that forms from the diploid zygote created by the fusion of haploid hyphae of different mating types. After a period of dormancy, the zygospore forms sporangia, where meiosis occurs and spores form.
heterogamy - state of having gametes of different sizes produced by different mating types or sexes.
Homothallism
A process occurring in some yeasts and other fungal strains where haploid spores formed during meiosis undergo self-diploidization due to the switching of mating type by some of the progeny of the spore.
Yeast cells come in two mating types and then cells are normally dividing. But if they come in the vicinity of one another, they each emit hormones that arrest the division of the other cell.
 See also: Mating, Cells, Organ, Cell, Biology
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