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Yeasts have asexual and sexual reproductive cycles; however the most common mode of vegetative growth in yeast is asexual reproduction by budding or fission. Here a small bud, 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 bud can develop on different parts of the parent cell depending on the genus of the yeast.Yeast needs the exact chemical form of sugar and cannot reproduce with sugar substitutes. However if the sugar substitute's chemical form is similar to sugar, yeast will reproduce a bit compared to many sugar substitutes where yeast will not reproduce at all. Under high stress conditions haploid cells will generally die, however under the same conditions 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. Yeast of the species Schizosaccharomyces pombe reproduce by binary fission instead of budding

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