<P> Certain strains of some species of yeasts produce proteins called yeast killer toxins that allow them to eliminate competing strains . (See main article on killer yeast .) This can cause problems for winemaking but could potentially also be used to advantage by using killer toxin - producing strains to make the wine . Yeast killer toxins may also have medical applications in treating yeast infections (see "Pathogenic yeasts" section below). </P> <Ol> <Li> Budding </Li> <Li> Conjugation </Li> <Li> Spore </Li> </Ol> <P> Yeasts, like all fungi, may have asexual and sexual reproductive cycles . The most common mode of vegetative growth in yeast is asexual reproduction by budding . Here, a small bud (also known as a bleb), or daughter cell, is formed on the parent cell . The nucleus of the parent cell splits into a daughter nucleus and migrates into the daughter cell . The bud continues to grow until it separates from the parent cell, forming a new cell . The daughter cell produced during the budding process is generally smaller than the mother cell . Some yeasts, including Schizosaccharomyces pombe, reproduce by fission instead of budding, thereby creating two identically sized daughter cells . </P> <P> In general, under high - stress conditions such as nutrient starvation, haploid cells will die; under the same conditions, however, diploid cells can undergo sporulation, entering sexual reproduction (meiosis) and producing a variety of haploid spores, which can go on to mate (conjugate), reforming the diploid . </P>

How many cells are in a yeast organism