Yeasts

Yeasts which are unicellular, are none of the most interesting and economically important groups of microscopic ascomycota. Most of their reproduction is asexual and takes place by cell fission or budding( the formation of a smaller cell from a larger one). Sometimes, however, whole yeasts cells may fuse. One of these cells, containing two nuclei, may then function as an ascus with syn gamy followed immediately by meiosis; the resulting ascospores function directly as new yeast cells.